diff --git a/doc/progs/file_windows.go b/doc/progs/file_windows.go
new file mode 100644
index 0000000000000000000000000000000000000000..d5e7c00d3c8a3a90e14e66a105330a21f779e901
--- /dev/null
+++ b/doc/progs/file_windows.go
@@ -0,0 +1,89 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package file
+
+import (
+	"os"
+	"syscall"
+)
+
+type File struct {
+	fd   syscall.Handle    // file descriptor number
+	name string // file name at Open time
+}
+
+func newFile(fd syscall.Handle, name string) *File {
+	if fd < 0 {
+		return nil
+	}
+	return &File{fd, name}
+}
+
+var (
+	Stdin  = newFile(syscall.Stdin, "/dev/stdin")
+	Stdout = newFile(syscall.Stdout, "/dev/stdout")
+	Stderr = newFile(syscall.Stderr, "/dev/stderr")
+)
+
+func OpenFile(name string, mode int, perm uint32) (file *File, err os.Error) {
+	r, e := syscall.Open(name, mode, perm)
+	if e != 0 {
+		err = os.Errno(e)
+	}
+	return newFile(r, name), err
+}
+
+const (
+	O_RDONLY = syscall.O_RDONLY
+	O_RDWR   = syscall.O_RDWR
+	O_CREATE = syscall.O_CREAT
+	O_TRUNC  = syscall.O_TRUNC
+)
+
+func Open(name string) (file *File, err os.Error) {
+	return OpenFile(name, O_RDONLY, 0)
+}
+
+func Create(name string) (file *File, err os.Error) {
+	return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666)
+}
+
+func (file *File) Close() os.Error {
+	if file == nil {
+		return os.EINVAL
+	}
+	e := syscall.Close(file.fd)
+	file.fd = syscall.InvalidHandle // so it can't be closed again
+	if e != 0 {
+		return os.Errno(e)
+	}
+	return nil
+}
+
+func (file *File) Read(b []byte) (ret int, err os.Error) {
+	if file == nil {
+		return -1, os.EINVAL
+	}
+	r, e := syscall.Read(file.fd, b)
+	if e != 0 {
+		err = os.Errno(e)
+	}
+	return int(r), err
+}
+
+func (file *File) Write(b []byte) (ret int, err os.Error) {
+	if file == nil {
+		return -1, os.EINVAL
+	}
+	r, e := syscall.Write(file.fd, b)
+	if e != 0 {
+		err = os.Errno(e)
+	}
+	return int(r), err
+}
+
+func (file *File) String() string {
+	return file.name
+}
diff --git a/doc/progs/run b/doc/progs/run
index 241e65dfadf201bff30a3d0d2d12ebc9b2428d16..81781c9d235ee19f34ab7818bea2480ffdf5f2c8 100755
--- a/doc/progs/run
+++ b/doc/progs/run
@@ -14,8 +14,13 @@ fi
 
 rm -f *.$O
 
+if [ "$GOOS" = "windows" ];then
+	$GC -o file.8 file_windows.go
+else
+	$GC file.go
+fi
+
 for i in \
-	file.go \
 	helloworld.go \
 	helloworld3.go \
 	echo.go \
diff --git a/src/pkg/crypto/rand/rand_windows.go b/src/pkg/crypto/rand/rand_windows.go
index 281d6dc6aaf14e1355cc8521af7d64fe98163233..0eab6b213a0a9ae68491830265bd4a29e3a46fbc 100755
--- a/src/pkg/crypto/rand/rand_windows.go
+++ b/src/pkg/crypto/rand/rand_windows.go
@@ -19,7 +19,7 @@ func init() { Reader = &rngReader{} }
 
 // A rngReader satisfies reads by reading from the Windows CryptGenRandom API.
 type rngReader struct {
-	prov uint32
+	prov syscall.Handle
 	mu   sync.Mutex
 }
 
diff --git a/src/pkg/net/fd_windows.go b/src/pkg/net/fd_windows.go
index 9ed7801d276322f3a57a856ca926bd89bc5184cd..41d06120a5a997f0146860220fba5801ce771560 100644
--- a/src/pkg/net/fd_windows.go
+++ b/src/pkg/net/fd_windows.go
@@ -29,8 +29,8 @@ func init() {
 	}
 }
 
-func closesocket(s int) (errno int) {
-	return syscall.Closesocket(int32(s))
+func closesocket(s syscall.Handle) (errno int) {
+	return syscall.Closesocket(s)
 }
 
 // Interface for all io operations.
@@ -88,7 +88,7 @@ func (o *bufOp) Init(fd *netFD, buf []byte) {
 // iocp and send them to the correspondent waiting client
 // goroutine via channel supplied in the request.
 type resultSrv struct {
-	iocp int32
+	iocp syscall.Handle
 }
 
 func (s *resultSrv) Run() {
@@ -132,7 +132,7 @@ func (s *ioSrv) ProcessRemoteIO() {
 		case o := <-s.submchan:
 			o.Op().errnoc <- o.Submit()
 		case o := <-s.canchan:
-			o.Op().errnoc <- syscall.CancelIo(uint32(o.Op().fd.sysfd))
+			o.Op().errnoc <- syscall.CancelIo(syscall.Handle(o.Op().fd.sysfd))
 		}
 	}
 }
@@ -189,7 +189,7 @@ var onceStartServer sync.Once
 func startServer() {
 	resultsrv = new(resultSrv)
 	var errno int
-	resultsrv.iocp, errno = syscall.CreateIoCompletionPort(-1, 0, 0, 1)
+	resultsrv.iocp, errno = syscall.CreateIoCompletionPort(syscall.InvalidHandle, 0, 0, 1)
 	if errno != 0 {
 		panic("CreateIoCompletionPort failed " + syscall.Errstr(errno))
 	}
@@ -209,7 +209,7 @@ type netFD struct {
 	closing bool
 
 	// immutable until Close
-	sysfd  int
+	sysfd  syscall.Handle
 	family int
 	proto  int
 	net    string
@@ -225,7 +225,7 @@ type netFD struct {
 	wio             sync.Mutex
 }
 
-func allocFD(fd, family, proto int, net string) (f *netFD) {
+func allocFD(fd syscall.Handle, family, proto int, net string) (f *netFD) {
 	f = &netFD{
 		sysfd:  fd,
 		family: family,
@@ -236,13 +236,13 @@ func allocFD(fd, family, proto int, net string) (f *netFD) {
 	return f
 }
 
-func newFD(fd, family, proto int, net string) (f *netFD, err os.Error) {
+func newFD(fd syscall.Handle, family, proto int, net string) (f *netFD, err os.Error) {
 	if initErr != nil {
 		return nil, initErr
 	}
 	onceStartServer.Do(startServer)
 	// Associate our socket with resultsrv.iocp.
-	if _, e := syscall.CreateIoCompletionPort(int32(fd), resultsrv.iocp, 0, 0); e != 0 {
+	if _, e := syscall.CreateIoCompletionPort(syscall.Handle(fd), resultsrv.iocp, 0, 0); e != 0 {
 		return nil, os.Errno(e)
 	}
 	return allocFD(fd, family, proto, net), nil
@@ -280,7 +280,7 @@ func (fd *netFD) decref() {
 		// use the resultsrv for Close too.  Sigh.
 		syscall.SetNonblock(fd.sysfd, false)
 		closesocket(fd.sysfd)
-		fd.sysfd = -1
+		fd.sysfd = syscall.InvalidHandle
 		// no need for a finalizer anymore
 		runtime.SetFinalizer(fd, nil)
 	}
@@ -288,7 +288,7 @@ func (fd *netFD) decref() {
 }
 
 func (fd *netFD) Close() os.Error {
-	if fd == nil || fd.sysfd == -1 {
+	if fd == nil || fd.sysfd == syscall.InvalidHandle {
 		return os.EINVAL
 	}
 
@@ -307,7 +307,7 @@ type readOp struct {
 
 func (o *readOp) Submit() (errno int) {
 	var d, f uint32
-	return syscall.WSARecv(uint32(o.fd.sysfd), &o.buf, 1, &d, &f, &o.o, nil)
+	return syscall.WSARecv(syscall.Handle(o.fd.sysfd), &o.buf, 1, &d, &f, &o.o, nil)
 }
 
 func (o *readOp) Name() string {
@@ -322,7 +322,7 @@ func (fd *netFD) Read(buf []byte) (n int, err os.Error) {
 	defer fd.rio.Unlock()
 	fd.incref()
 	defer fd.decref()
-	if fd.sysfd == -1 {
+	if fd.sysfd == syscall.InvalidHandle {
 		return 0, os.EINVAL
 	}
 	var o readOp
@@ -344,7 +344,7 @@ type readFromOp struct {
 func (o *readFromOp) Submit() (errno int) {
 	var d, f uint32
 	l := int32(unsafe.Sizeof(o.rsa))
-	return syscall.WSARecvFrom(uint32(o.fd.sysfd), &o.buf, 1, &d, &f, &o.rsa, &l, &o.o, nil)
+	return syscall.WSARecvFrom(o.fd.sysfd, &o.buf, 1, &d, &f, &o.rsa, &l, &o.o, nil)
 }
 
 func (o *readFromOp) Name() string {
@@ -362,7 +362,7 @@ func (fd *netFD) ReadFrom(buf []byte) (n int, sa syscall.Sockaddr, err os.Error)
 	defer fd.rio.Unlock()
 	fd.incref()
 	defer fd.decref()
-	if fd.sysfd == -1 {
+	if fd.sysfd == syscall.InvalidHandle {
 		return 0, nil, os.EINVAL
 	}
 	var o readFromOp
@@ -380,7 +380,7 @@ type writeOp struct {
 
 func (o *writeOp) Submit() (errno int) {
 	var d uint32
-	return syscall.WSASend(uint32(o.fd.sysfd), &o.buf, 1, &d, 0, &o.o, nil)
+	return syscall.WSASend(o.fd.sysfd, &o.buf, 1, &d, 0, &o.o, nil)
 }
 
 func (o *writeOp) Name() string {
@@ -395,7 +395,7 @@ func (fd *netFD) Write(buf []byte) (n int, err os.Error) {
 	defer fd.wio.Unlock()
 	fd.incref()
 	defer fd.decref()
-	if fd.sysfd == -1 {
+	if fd.sysfd == syscall.InvalidHandle {
 		return 0, os.EINVAL
 	}
 	var o writeOp
@@ -412,7 +412,7 @@ type writeToOp struct {
 
 func (o *writeToOp) Submit() (errno int) {
 	var d uint32
-	return syscall.WSASendto(uint32(o.fd.sysfd), &o.buf, 1, &d, 0, o.sa, &o.o, nil)
+	return syscall.WSASendto(o.fd.sysfd, &o.buf, 1, &d, 0, o.sa, &o.o, nil)
 }
 
 func (o *writeToOp) Name() string {
@@ -430,7 +430,7 @@ func (fd *netFD) WriteTo(buf []byte, sa syscall.Sockaddr) (n int, err os.Error)
 	defer fd.wio.Unlock()
 	fd.incref()
 	defer fd.decref()
-	if fd.sysfd == -1 {
+	if fd.sysfd == syscall.InvalidHandle {
 		return 0, os.EINVAL
 	}
 	var o writeToOp
@@ -443,14 +443,14 @@ func (fd *netFD) WriteTo(buf []byte, sa syscall.Sockaddr) (n int, err os.Error)
 
 type acceptOp struct {
 	anOp
-	newsock int
+	newsock syscall.Handle
 	attrs   [2]syscall.RawSockaddrAny // space for local and remote address only
 }
 
 func (o *acceptOp) Submit() (errno int) {
 	var d uint32
 	l := uint32(unsafe.Sizeof(o.attrs[0]))
-	return syscall.AcceptEx(uint32(o.fd.sysfd), uint32(o.newsock),
+	return syscall.AcceptEx(o.fd.sysfd, o.newsock,
 		(*byte)(unsafe.Pointer(&o.attrs[0])), 0, l, l, &d, &o.o)
 }
 
@@ -459,7 +459,7 @@ func (o *acceptOp) Name() string {
 }
 
 func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.Error) {
-	if fd == nil || fd.sysfd == -1 {
+	if fd == nil || fd.sysfd == syscall.InvalidHandle {
 		return nil, os.EINVAL
 	}
 	fd.incref()
@@ -478,7 +478,7 @@ func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.
 
 	// Associate our new socket with IOCP.
 	onceStartServer.Do(startServer)
-	if _, e = syscall.CreateIoCompletionPort(int32(s), resultsrv.iocp, 0, 0); e != 0 {
+	if _, e = syscall.CreateIoCompletionPort(s, resultsrv.iocp, 0, 0); e != 0 {
 		return nil, &OpError{"CreateIoCompletionPort", fd.net, fd.laddr, os.Errno(e)}
 	}
 
@@ -493,7 +493,7 @@ func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.
 	}
 
 	// Inherit properties of the listening socket.
-	e = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_UPDATE_ACCEPT_CONTEXT, fd.sysfd)
+	e = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_UPDATE_ACCEPT_CONTEXT, int(fd.sysfd))
 	if e != 0 {
 		closesocket(s)
 		return nil, err
diff --git a/src/pkg/net/interface_windows.go b/src/pkg/net/interface_windows.go
index f54ffed70eda3992711850248fce16e580d6218c..198e4096f693822b568c57b14c64ff938bdc8e54 100644
--- a/src/pkg/net/interface_windows.go
+++ b/src/pkg/net/interface_windows.go
@@ -42,12 +42,12 @@ func getInterfaceList() ([]syscall.InterfaceInfo, os.Error) {
 	if e != 0 {
 		return nil, os.NewSyscallError("Socket", e)
 	}
-	defer syscall.Closesocket(int32(s))
+	defer syscall.Closesocket(s)
 
 	ii := [20]syscall.InterfaceInfo{}
 	ret := uint32(0)
 	size := uint32(unsafe.Sizeof(ii))
-	e = syscall.WSAIoctl(int32(s), syscall.SIO_GET_INTERFACE_LIST, nil, 0, (*byte)(unsafe.Pointer(&ii[0])), size, &ret, nil, 0)
+	e = syscall.WSAIoctl(s, syscall.SIO_GET_INTERFACE_LIST, nil, 0, (*byte)(unsafe.Pointer(&ii[0])), size, &ret, nil, 0)
 	if e != 0 {
 		return nil, os.NewSyscallError("WSAIoctl", e)
 	}
diff --git a/src/pkg/net/ipsock.go b/src/pkg/net/ipsock.go
index 5d56520a9164b5e3b67087259da4ee5702a66e24..e831d9afc0802d7773df2730a520f255dadc72dd 100644
--- a/src/pkg/net/ipsock.go
+++ b/src/pkg/net/ipsock.go
@@ -26,28 +26,26 @@ import (
 // boolean value is true, kernel supports IPv6 IPv4-mapping.
 func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
 	var probes = []struct {
-		s  int
 		la TCPAddr
 		ok bool
 	}{
 		// IPv6 communication capability
-		{-1, TCPAddr{IP: ParseIP("::1")}, false},
+		{TCPAddr{IP: ParseIP("::1")}, false},
 		// IPv6 IPv4-mapped address communication capability
-		{-1, TCPAddr{IP: IPv4(127, 0, 0, 1)}, false},
+		{TCPAddr{IP: IPv4(127, 0, 0, 1)}, false},
 	}
-	var errno int
 
 	for i := range probes {
-		probes[i].s, errno = syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
+		s, errno := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
 		if errno != 0 {
 			continue
 		}
-		defer closesocket(probes[i].s)
+		defer closesocket(s)
 		sa, err := probes[i].la.toAddr().sockaddr(syscall.AF_INET6)
 		if err != nil {
 			continue
 		}
-		errno = syscall.Bind(probes[i].s, sa)
+		errno = syscall.Bind(s, sa)
 		if errno != 0 {
 			continue
 		}
diff --git a/src/pkg/net/sendfile_windows.go b/src/pkg/net/sendfile_windows.go
index 34abc5490b71ab3709470c7fd03ee3894ea6939a..3772eee24900c332f557135895377386ba1ea074 100644
--- a/src/pkg/net/sendfile_windows.go
+++ b/src/pkg/net/sendfile_windows.go
@@ -12,12 +12,12 @@ import (
 
 type sendfileOp struct {
 	anOp
-	src int32 // source
+	src syscall.Handle // source
 	n   uint32
 }
 
 func (o *sendfileOp) Submit() (errno int) {
-	return syscall.TransmitFile(int32(o.fd.sysfd), o.src, o.n, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
+	return syscall.TransmitFile(o.fd.sysfd, o.src, o.n, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
 }
 
 func (o *sendfileOp) Name() string {
@@ -56,7 +56,7 @@ func sendFile(c *netFD, r io.Reader) (written int64, err os.Error, handled bool)
 	var o sendfileOp
 	o.Init(c)
 	o.n = uint32(n)
-	o.src = int32(f.Fd())
+	o.src = f.Fd()
 	done, err := iosrv.ExecIO(&o, 0)
 	if err != nil {
 		return 0, err, false
diff --git a/src/pkg/net/sock.go b/src/pkg/net/sock.go
index eae7f3711dbf6a7fcfcb37622917d5227539f033..821716e43bda15ffa3186fddc1d87b7f6d34d2dc 100644
--- a/src/pkg/net/sock.go
+++ b/src/pkg/net/sock.go
@@ -50,8 +50,7 @@ func socket(net string, f, p, t int, la, ra syscall.Sockaddr, toAddr func(syscal
 
 	if ra != nil {
 		if err = fd.connect(ra); err != nil {
-			fd.sysfd = -1
-			closesocket(s)
+			fd.Close()
 			return nil, err
 		}
 	}
@@ -65,25 +64,25 @@ func socket(net string, f, p, t int, la, ra syscall.Sockaddr, toAddr func(syscal
 	return fd, nil
 }
 
-func setsockoptInt(fd, level, opt int, value int) os.Error {
-	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, level, opt, value))
+func setsockoptInt(fd *netFD, level, opt int, value int) os.Error {
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, level, opt, value))
 }
 
-func setsockoptNsec(fd, level, opt int, nsec int64) os.Error {
+func setsockoptNsec(fd *netFD, level, opt int, nsec int64) os.Error {
 	var tv = syscall.NsecToTimeval(nsec)
-	return os.NewSyscallError("setsockopt", syscall.SetsockoptTimeval(fd, level, opt, &tv))
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptTimeval(fd.sysfd, level, opt, &tv))
 }
 
 func setReadBuffer(fd *netFD, bytes int) os.Error {
 	fd.incref()
 	defer fd.decref()
-	return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
+	return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
 }
 
 func setWriteBuffer(fd *netFD, bytes int) os.Error {
 	fd.incref()
 	defer fd.decref()
-	return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes)
+	return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes)
 }
 
 func setReadTimeout(fd *netFD, nsec int64) os.Error {
@@ -106,7 +105,7 @@ func setTimeout(fd *netFD, nsec int64) os.Error {
 func setReuseAddr(fd *netFD, reuse bool) os.Error {
 	fd.incref()
 	defer fd.decref()
-	return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, boolint(reuse))
+	return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, boolint(reuse))
 }
 
 func bindToDevice(fd *netFD, dev string) os.Error {
@@ -117,19 +116,19 @@ func bindToDevice(fd *netFD, dev string) os.Error {
 func setDontRoute(fd *netFD, dontroute bool) os.Error {
 	fd.incref()
 	defer fd.decref()
-	return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_DONTROUTE, boolint(dontroute))
+	return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_DONTROUTE, boolint(dontroute))
 }
 
 func setKeepAlive(fd *netFD, keepalive bool) os.Error {
 	fd.incref()
 	defer fd.decref()
-	return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))
+	return setsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))
 }
 
 func setNoDelay(fd *netFD, noDelay bool) os.Error {
 	fd.incref()
 	defer fd.decref()
-	return setsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_NODELAY, boolint(noDelay))
+	return setsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_NODELAY, boolint(noDelay))
 }
 
 func setLinger(fd *netFD, sec int) os.Error {
diff --git a/src/pkg/net/sock_windows.go b/src/pkg/net/sock_windows.go
index e17c60b98b6e11ab49f8854a8032145c6f5f9e4f..c6dbd046567761e9334e6777caa39fb51587ba66 100644
--- a/src/pkg/net/sock_windows.go
+++ b/src/pkg/net/sock_windows.go
@@ -10,7 +10,7 @@ import (
 	"syscall"
 )
 
-func setKernelSpecificSockopt(s, f int) {
+func setKernelSpecificSockopt(s syscall.Handle, f int) {
 	// Allow reuse of recently-used addresses and ports.
 	syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
 
diff --git a/src/pkg/os/env_windows.go b/src/pkg/os/env_windows.go
index a45d79be32a56b54faa3eaec2d13dab203ed6a70..e6ddc4065fe4a1edf6a3cd584758baa700c1270a 100644
--- a/src/pkg/os/env_windows.go
+++ b/src/pkg/os/env_windows.go
@@ -119,7 +119,7 @@ func init() {
 	if e != 0 {
 		return
 	}
-	defer syscall.LocalFree(uint32(uintptr(unsafe.Pointer(argv))))
+	defer syscall.LocalFree(syscall.Handle(uintptr(unsafe.Pointer(argv))))
 	Args = make([]string, argc)
 	for i, v := range (*argv)[:argc] {
 		Args[i] = string(syscall.UTF16ToString((*v)[:]))
diff --git a/src/pkg/os/exec_posix.go b/src/pkg/os/exec_posix.go
index 7dfcdd48615b97940f414652cf6e8fa5adccc41b..e2097700e970efcd3375f75278d35e852f788c61 100644
--- a/src/pkg/os/exec_posix.go
+++ b/src/pkg/os/exec_posix.go
@@ -35,16 +35,9 @@ func StartProcess(name string, argv []string, attr *ProcAttr) (p *Process, err E
 	if sysattr.Env == nil {
 		sysattr.Env = Environ()
 	}
-	// Create array of integer (system) fds.
-	intfd := make([]int, len(attr.Files))
-	for i, f := range attr.Files {
-		if f == nil {
-			intfd[i] = -1
-		} else {
-			intfd[i] = f.Fd()
-		}
+	for _, f := range attr.Files {
+		sysattr.Files = append(sysattr.Files, f.Fd())
 	}
-	sysattr.Files = intfd
 
 	pid, h, e := syscall.StartProcess(name, argv, sysattr)
 	if iserror(e) {
diff --git a/src/pkg/os/exec_windows.go b/src/pkg/os/exec_windows.go
index 991099d4f45202beb42d6d98c62375ba0de8eb60..5b432d39884e6a8444ac23c39631a6eab15cb114 100644
--- a/src/pkg/os/exec_windows.go
+++ b/src/pkg/os/exec_windows.go
@@ -10,7 +10,7 @@ import (
 )
 
 func (p *Process) Wait(options int) (w *Waitmsg, err Error) {
-	s, e := syscall.WaitForSingleObject(int32(p.handle), syscall.INFINITE)
+	s, e := syscall.WaitForSingleObject(syscall.Handle(p.handle), syscall.INFINITE)
 	switch s {
 	case syscall.WAIT_OBJECT_0:
 		break
@@ -20,7 +20,7 @@ func (p *Process) Wait(options int) (w *Waitmsg, err Error) {
 		return nil, NewError("os: unexpected result from WaitForSingleObject")
 	}
 	var ec uint32
-	e = syscall.GetExitCodeProcess(int32(p.handle), &ec)
+	e = syscall.GetExitCodeProcess(syscall.Handle(p.handle), &ec)
 	if e != 0 {
 		return nil, NewSyscallError("GetExitCodeProcess", e)
 	}
@@ -31,7 +31,7 @@ func (p *Process) Wait(options int) (w *Waitmsg, err Error) {
 func (p *Process) Signal(sig Signal) Error {
 	switch sig.(UnixSignal) {
 	case SIGKILL:
-		e := syscall.TerminateProcess(int32(p.handle), 1)
+		e := syscall.TerminateProcess(syscall.Handle(p.handle), 1)
 		return NewSyscallError("TerminateProcess", e)
 	}
 	return Errno(syscall.EWINDOWS)
@@ -41,7 +41,7 @@ func (p *Process) Release() Error {
 	if p.handle == -1 {
 		return EINVAL
 	}
-	e := syscall.CloseHandle(int32(p.handle))
+	e := syscall.CloseHandle(syscall.Handle(p.handle))
 	if e != 0 {
 		return NewSyscallError("CloseHandle", e)
 	}
diff --git a/src/pkg/os/file.go b/src/pkg/os/file.go
index 1b8faec494a6b279b4682a3f1d65137f500eb9d7..4335d45e5a0edd07b60861fe8e03d43fc462c884 100644
--- a/src/pkg/os/file.go
+++ b/src/pkg/os/file.go
@@ -9,36 +9,12 @@
 package os
 
 import (
-	"runtime"
-	"sync"
 	"syscall"
 )
 
-// File represents an open file descriptor.
-type File struct {
-	fd      int
-	name    string
-	dirinfo *dirInfo   // nil unless directory being read
-	nepipe  int        // number of consecutive EPIPE in Write
-	l       sync.Mutex // used to implement windows pread/pwrite
-}
-
-// Fd returns the integer Unix file descriptor referencing the open file.
-func (file *File) Fd() int { return file.fd }
-
 // Name returns the name of the file as presented to Open.
 func (file *File) Name() string { return file.name }
 
-// NewFile returns a new File with the given file descriptor and name.
-func NewFile(fd int, name string) *File {
-	if fd < 0 {
-		return nil
-	}
-	f := &File{fd: fd, name: name}
-	runtime.SetFinalizer(f, (*File).Close)
-	return f
-}
-
 // Stdin, Stdout, and Stderr are open Files pointing to the standard input,
 // standard output, and standard error file descriptors.
 var (
diff --git a/src/pkg/os/file_posix.go b/src/pkg/os/file_posix.go
index 05db6bc300bf059a9a267d8642c4e2492e64d665..0791a0dc04ba84a946f3d2e611ff1d5282e463fb 100644
--- a/src/pkg/os/file_posix.go
+++ b/src/pkg/os/file_posix.go
@@ -21,26 +21,6 @@ func epipecheck(file *File, e int) {
 	}
 }
 
-
-// Pipe returns a connected pair of Files; reads from r return bytes written to w.
-// It returns the files and an Error, if any.
-func Pipe() (r *File, w *File, err Error) {
-	var p [2]int
-
-	// See ../syscall/exec.go for description of lock.
-	syscall.ForkLock.RLock()
-	e := syscall.Pipe(p[0:])
-	if iserror(e) {
-		syscall.ForkLock.RUnlock()
-		return nil, nil, NewSyscallError("pipe", e)
-	}
-	syscall.CloseOnExec(p[0])
-	syscall.CloseOnExec(p[1])
-	syscall.ForkLock.RUnlock()
-
-	return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
-}
-
 // Stat returns a FileInfo structure describing the named file and an error, if any.
 // If name names a valid symbolic link, the returned FileInfo describes
 // the file pointed at by the link and has fi.FollowedSymlink set to true.
diff --git a/src/pkg/os/file_unix.go b/src/pkg/os/file_unix.go
index def9b3bf07de9ca95fb7b900ffe13fb8652e3ea1..bda6a1ed338fca8e64e7b13eb69d25f56caf041c 100644
--- a/src/pkg/os/file_unix.go
+++ b/src/pkg/os/file_unix.go
@@ -6,9 +6,37 @@ package os
 
 import (
 	"runtime"
+	"sync"
 	"syscall"
 )
 
+// File represents an open file descriptor.
+type File struct {
+	fd      int
+	name    string
+	dirinfo *dirInfo   // nil unless directory being read
+	nepipe  int        // number of consecutive EPIPE in Write
+	l       sync.Mutex // used to implement windows pread/pwrite
+}
+
+// Fd returns the integer Unix file descriptor referencing the open file.
+func (file *File) Fd() int {
+	if file == nil {
+		return -1
+	}
+	return file.fd
+}
+
+// NewFile returns a new File with the given file descriptor and name.
+func NewFile(fd int, name string) *File {
+	if fd < 0 {
+		return nil
+	}
+	f := &File{fd: fd, name: name}
+	runtime.SetFinalizer(f, (*File).Close)
+	return f
+}
+
 // Auxiliary information if the File describes a directory
 type dirInfo struct {
 	buf  []byte // buffer for directory I/O
@@ -161,3 +189,22 @@ func basename(name string) string {
 
 	return name
 }
+
+// Pipe returns a connected pair of Files; reads from r return bytes written to w.
+// It returns the files and an Error, if any.
+func Pipe() (r *File, w *File, err Error) {
+	var p [2]int
+
+	// See ../syscall/exec.go for description of lock.
+	syscall.ForkLock.RLock()
+	e := syscall.Pipe(p[0:])
+	if iserror(e) {
+		syscall.ForkLock.RUnlock()
+		return nil, nil, NewSyscallError("pipe", e)
+	}
+	syscall.CloseOnExec(p[0])
+	syscall.CloseOnExec(p[1])
+	syscall.ForkLock.RUnlock()
+
+	return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
+}
diff --git a/src/pkg/os/file_windows.go b/src/pkg/os/file_windows.go
index 80886f6f525d7fe27beda2e1a68752bb1254e854..70dd6e24103e9c19d89a9aae1f4b92492cde3ef6 100644
--- a/src/pkg/os/file_windows.go
+++ b/src/pkg/os/file_windows.go
@@ -6,9 +6,37 @@ package os
 
 import (
 	"runtime"
+	"sync"
 	"syscall"
 )
 
+// File represents an open file descriptor.
+type File struct {
+	fd      syscall.Handle
+	name    string
+	dirinfo *dirInfo   // nil unless directory being read
+	nepipe  int        // number of consecutive EPIPE in Write
+	l       sync.Mutex // used to implement windows pread/pwrite
+}
+
+// Fd returns the Windows handle referencing the open file.
+func (file *File) Fd() syscall.Handle {
+	if file == nil {
+		return syscall.InvalidHandle
+	}
+	return file.fd
+}
+
+// NewFile returns a new File with the given file descriptor and name.
+func NewFile(fd syscall.Handle, name string) *File {
+	if fd < 0 {
+		return nil
+	}
+	f := &File{fd: fd, name: name}
+	runtime.SetFinalizer(f, (*File).Close)
+	return f
+}
+
 // Auxiliary information if the File describes a directory
 type dirInfo struct {
 	stat         syscall.Stat_t
@@ -40,7 +68,7 @@ func openDir(name string) (file *File, err Error) {
 	if e != 0 {
 		return nil, &PathError{"open", name, Errno(e)}
 	}
-	f := NewFile(int(r), name)
+	f := NewFile(r, name)
 	d.usefirststat = true
 	f.dirinfo = d
 	return f, nil
@@ -85,15 +113,15 @@ func (file *File) Close() Error {
 	}
 	var e int
 	if file.isdir() {
-		e = syscall.FindClose(int32(file.fd))
+		e = syscall.FindClose(syscall.Handle(file.fd))
 	} else {
-		e = syscall.CloseHandle(int32(file.fd))
+		e = syscall.CloseHandle(syscall.Handle(file.fd))
 	}
 	var err Error
 	if e != 0 {
 		err = &PathError{"close", file.name, Errno(e)}
 	}
-	file.fd = -1 // so it can't be closed again
+	file.fd = syscall.InvalidHandle // so it can't be closed again
 
 	// no need for a finalizer anymore
 	runtime.SetFinalizer(file, nil)
@@ -102,7 +130,7 @@ func (file *File) Close() Error {
 
 func (file *File) statFile(name string) (fi *FileInfo, err Error) {
 	var stat syscall.ByHandleFileInformation
-	e := syscall.GetFileInformationByHandle(int32(file.fd), &stat)
+	e := syscall.GetFileInformationByHandle(syscall.Handle(file.fd), &stat)
 	if e != 0 {
 		return nil, &PathError{"stat", file.name, Errno(e)}
 	}
@@ -156,7 +184,7 @@ func (file *File) Readdir(n int) (fi []FileInfo, err Error) {
 		if di.usefirststat {
 			di.usefirststat = false
 		} else {
-			e := syscall.FindNextFile(int32(file.fd), &di.stat.Windata)
+			e := syscall.FindNextFile(syscall.Handle(file.fd), &di.stat.Windata)
 			if e != 0 {
 				if e == syscall.ERROR_NO_MORE_FILES {
 					break
@@ -207,7 +235,7 @@ func (f *File) pread(b []byte, off int64) (n int, err int) {
 		Offset:     uint32(off),
 	}
 	var done uint32
-	e = syscall.ReadFile(int32(f.fd), b, &done, &o)
+	e = syscall.ReadFile(syscall.Handle(f.fd), b, &done, &o)
 	if e != 0 {
 		return 0, e
 	}
@@ -237,7 +265,7 @@ func (f *File) pwrite(b []byte, off int64) (n int, err int) {
 		Offset:     uint32(off),
 	}
 	var done uint32
-	e = syscall.WriteFile(int32(f.fd), b, &done, &o)
+	e = syscall.WriteFile(syscall.Handle(f.fd), b, &done, &o)
 	if e != 0 {
 		return 0, e
 	}
@@ -268,3 +296,22 @@ func Truncate(name string, size int64) Error {
 	}
 	return nil
 }
+
+// Pipe returns a connected pair of Files; reads from r return bytes written to w.
+// It returns the files and an Error, if any.
+func Pipe() (r *File, w *File, err Error) {
+	var p [2]syscall.Handle
+
+	// See ../syscall/exec.go for description of lock.
+	syscall.ForkLock.RLock()
+	e := syscall.Pipe(p[0:])
+	if iserror(e) {
+		syscall.ForkLock.RUnlock()
+		return nil, nil, NewSyscallError("pipe", e)
+	}
+	syscall.CloseOnExec(p[0])
+	syscall.CloseOnExec(p[1])
+	syscall.ForkLock.RUnlock()
+
+	return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
+}
diff --git a/src/pkg/syscall/exec_windows.go b/src/pkg/syscall/exec_windows.go
index 96a01e7675f05e81f72fdc4448ffba9c89821f62..e8b540ad1603e6e247adf1aecfd3e59edc967dd7 100644
--- a/src/pkg/syscall/exec_windows.go
+++ b/src/pkg/syscall/exec_windows.go
@@ -121,11 +121,11 @@ func createEnvBlock(envv []string) *uint16 {
 	return &utf16.Encode([]int(string(b)))[0]
 }
 
-func CloseOnExec(fd int) {
-	SetHandleInformation(int32(fd), HANDLE_FLAG_INHERIT, 0)
+func CloseOnExec(fd Handle) {
+	SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0)
 }
 
-func SetNonblock(fd int, nonblocking bool) (errno int) {
+func SetNonblock(fd Handle, nonblocking bool) (errno int) {
 	return 0
 }
 
@@ -220,7 +220,7 @@ func joinExeDirAndFName(dir, p string) (name string, err int) {
 type ProcAttr struct {
 	Dir   string
 	Env   []string
-	Files []int
+	Files []Handle
 	Sys   *SysProcAttr
 }
 
@@ -290,14 +290,14 @@ func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid, handle int,
 	defer ForkLock.Unlock()
 
 	p, _ := GetCurrentProcess()
-	fd := make([]int32, len(attr.Files))
+	fd := make([]Handle, len(attr.Files))
 	for i := range attr.Files {
 		if attr.Files[i] > 0 {
-			err := DuplicateHandle(p, int32(attr.Files[i]), p, &fd[i], 0, true, DUPLICATE_SAME_ACCESS)
+			err := DuplicateHandle(p, Handle(attr.Files[i]), p, &fd[i], 0, true, DUPLICATE_SAME_ACCESS)
 			if err != 0 {
 				return 0, 0, err
 			}
-			defer CloseHandle(int32(fd[i]))
+			defer CloseHandle(Handle(fd[i]))
 		}
 	}
 	si := new(StartupInfo)
@@ -317,7 +317,7 @@ func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid, handle int,
 	if err != 0 {
 		return 0, 0, err
 	}
-	defer CloseHandle(pi.Thread)
+	defer CloseHandle(Handle(pi.Thread))
 
 	return int(pi.ProcessId), int(pi.Process), 0
 }
diff --git a/src/pkg/syscall/syscall_windows.go b/src/pkg/syscall/syscall_windows.go
index 0e979ff6b5b3111b641dfe1897c1e58927142529..54dda0238e626250d122ebe7c7a233d9cf1a141d 100644
--- a/src/pkg/syscall/syscall_windows.go
+++ b/src/pkg/syscall/syscall_windows.go
@@ -13,6 +13,10 @@ import (
 
 const OS = "windows"
 
+type Handle uintptr
+
+const InvalidHandle = ^Handle(0)
+
 /*
 
 small demo to detect version of windows you are running:
@@ -77,10 +81,10 @@ func Syscall(trap, nargs, a1, a2, a3 uintptr) (r1, r2, err uintptr)
 func Syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
 func Syscall9(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr)
 func Syscall12(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12 uintptr) (r1, r2, err uintptr)
-func loadlibraryex(filename uintptr) (handle uint32)
-func getprocaddress(handle uint32, procname uintptr) (proc uintptr)
+func loadlibraryex(filename uintptr) (handle uintptr)
+func getprocaddress(handle uintptr, procname uintptr) (proc uintptr)
 
-func loadDll(fname string) uint32 {
+func loadDll(fname string) uintptr {
 	m := loadlibraryex(uintptr(unsafe.Pointer(StringBytePtr(fname))))
 	if m == 0 {
 		panic("syscall: could not LoadLibraryEx " + fname)
@@ -88,7 +92,7 @@ func loadDll(fname string) uint32 {
 	return m
 }
 
-func getSysProcAddr(m uint32, pname string) uintptr {
+func getSysProcAddr(m uintptr, pname string) uintptr {
 	p := getprocaddress(m, uintptr(unsafe.Pointer(StringBytePtr(pname))))
 	if p == 0 {
 		panic("syscall: could not GetProcAddress for " + pname)
@@ -110,22 +114,22 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, errno
 // windows api calls
 
 //sys	GetLastError() (lasterrno int)
-//sys	LoadLibrary(libname string) (handle uint32, errno int) = LoadLibraryW
-//sys	FreeLibrary(handle uint32) (errno int)
-//sys	GetProcAddress(module uint32, procname string) (proc uint32, errno int)
+//sys	LoadLibrary(libname string) (handle Handle, errno int) = LoadLibraryW
+//sys	FreeLibrary(handle Handle) (errno int)
+//sys	GetProcAddress(module Handle, procname string) (proc Handle, errno int)
 //sys	GetVersion() (ver uint32, errno int)
 //sys	FormatMessage(flags uint32, msgsrc uint32, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, errno int) = FormatMessageW
 //sys	ExitProcess(exitcode uint32)
-//sys	CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle int32, errno int) [failretval==-1] = CreateFileW
-//sys	ReadFile(handle int32, buf []byte, done *uint32, overlapped *Overlapped) (errno int)
-//sys	WriteFile(handle int32, buf []byte, done *uint32, overlapped *Overlapped) (errno int)
-//sys	SetFilePointer(handle int32, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, errno int) [failretval==0xffffffff]
-//sys	CloseHandle(handle int32) (errno int)
-//sys	GetStdHandle(stdhandle int32) (handle int32, errno int) [failretval==-1]
-//sys	FindFirstFile(name *uint16, data *Win32finddata) (handle int32, errno int) [failretval==-1] = FindFirstFileW
-//sys	FindNextFile(handle int32, data *Win32finddata) (errno int) = FindNextFileW
-//sys	FindClose(handle int32) (errno int)
-//sys	GetFileInformationByHandle(handle int32, data *ByHandleFileInformation) (errno int)
+//sys	CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, errno int) [failretval==InvalidHandle] = CreateFileW
+//sys	ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (errno int)
+//sys	WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (errno int)
+//sys	SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, errno int) [failretval==0xffffffff]
+//sys	CloseHandle(handle Handle) (errno int)
+//sys	GetStdHandle(stdhandle int) (handle Handle, errno int) [failretval==InvalidHandle]
+//sys	FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, errno int) [failretval==InvalidHandle] = FindFirstFileW
+//sys	FindNextFile(handle Handle, data *Win32finddata) (errno int) = FindNextFileW
+//sys	FindClose(handle Handle) (errno int)
+//sys	GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (errno int)
 //sys	GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, errno int) = GetCurrentDirectoryW
 //sys	SetCurrentDirectory(path *uint16) (errno int) = SetCurrentDirectoryW
 //sys	CreateDirectory(path *uint16, sa *SecurityAttributes) (errno int) = CreateDirectoryW
@@ -133,47 +137,47 @@ func Sendfile(outfd int, infd int, offset *int64, count int) (written int, errno
 //sys	DeleteFile(path *uint16) (errno int) = DeleteFileW
 //sys	MoveFile(from *uint16, to *uint16) (errno int) = MoveFileW
 //sys	GetComputerName(buf *uint16, n *uint32) (errno int) = GetComputerNameW
-//sys	SetEndOfFile(handle int32) (errno int)
+//sys	SetEndOfFile(handle Handle) (errno int)
 //sys	GetSystemTimeAsFileTime(time *Filetime)
 //sys	sleep(msec uint32) = Sleep
 //sys	GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, errno int) [failretval==0xffffffff]
-//sys	CreateIoCompletionPort(filehandle int32, cphandle int32, key uint32, threadcnt uint32) (handle int32, errno int)
-//sys	GetQueuedCompletionStatus(cphandle int32, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (errno int)
-//sys	CancelIo(s uint32) (errno int)
+//sys	CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (handle Handle, errno int)
+//sys	GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (errno int)
+//sys	CancelIo(s Handle) (errno int)
 //sys	CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (errno int) = CreateProcessW
-//sys	OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle int32, errno int)
-//sys	TerminateProcess(handle int32, exitcode uint32) (errno int)
-//sys	GetExitCodeProcess(handle int32, exitcode *uint32) (errno int)
+//sys	OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, errno int)
+//sys	TerminateProcess(handle Handle, exitcode uint32) (errno int)
+//sys	GetExitCodeProcess(handle Handle, exitcode *uint32) (errno int)
 //sys	GetStartupInfo(startupInfo *StartupInfo) (errno int) = GetStartupInfoW
-//sys	GetCurrentProcess() (pseudoHandle int32, errno int)
-//sys	DuplicateHandle(hSourceProcessHandle int32, hSourceHandle int32, hTargetProcessHandle int32, lpTargetHandle *int32, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (errno int)
-//sys	WaitForSingleObject(handle int32, waitMilliseconds uint32) (event uint32, errno int) [failretval==0xffffffff]
+//sys	GetCurrentProcess() (pseudoHandle Handle, errno int)
+//sys	DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (errno int)
+//sys	WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, errno int) [failretval==0xffffffff]
 //sys	GetTempPath(buflen uint32, buf *uint16) (n uint32, errno int) = GetTempPathW
-//sys	CreatePipe(readhandle *uint32, writehandle *uint32, sa *SecurityAttributes, size uint32) (errno int)
-//sys	GetFileType(filehandle uint32) (n uint32, errno int)
-//sys	CryptAcquireContext(provhandle *uint32, container *uint16, provider *uint16, provtype uint32, flags uint32) (errno int) = advapi32.CryptAcquireContextW
-//sys	CryptReleaseContext(provhandle uint32, flags uint32) (errno int) = advapi32.CryptReleaseContext
-//sys	CryptGenRandom(provhandle uint32, buflen uint32, buf *byte) (errno int) = advapi32.CryptGenRandom
+//sys	CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (errno int)
+//sys	GetFileType(filehandle Handle) (n uint32, errno int)
+//sys	CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (errno int) = advapi32.CryptAcquireContextW
+//sys	CryptReleaseContext(provhandle Handle, flags uint32) (errno int) = advapi32.CryptReleaseContext
+//sys	CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (errno int) = advapi32.CryptGenRandom
 //sys	GetEnvironmentStrings() (envs *uint16, errno int) [failretval==nil] = kernel32.GetEnvironmentStringsW
 //sys	FreeEnvironmentStrings(envs *uint16) (errno int) = kernel32.FreeEnvironmentStringsW
 //sys	GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, errno int) = kernel32.GetEnvironmentVariableW
 //sys	SetEnvironmentVariable(name *uint16, value *uint16) (errno int) = kernel32.SetEnvironmentVariableW
-//sys	SetFileTime(handle int32, ctime *Filetime, atime *Filetime, wtime *Filetime) (errno int)
+//sys	SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (errno int)
 //sys	GetFileAttributes(name *uint16) (attrs uint32, errno int) [failretval==INVALID_FILE_ATTRIBUTES] = kernel32.GetFileAttributesW
 //sys	SetFileAttributes(name *uint16, attrs uint32) (errno int) = kernel32.SetFileAttributesW
 //sys	GetCommandLine() (cmd *uint16) = kernel32.GetCommandLineW
 //sys	CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, errno int) [failretval==nil] = shell32.CommandLineToArgvW
-//sys	LocalFree(hmem uint32) (handle uint32, errno int) [failretval!=0]
-//sys	SetHandleInformation(handle int32, mask uint32, flags uint32) (errno int)
-//sys	FlushFileBuffers(handle int32) (errno int)
+//sys	LocalFree(hmem Handle) (handle Handle, errno int) [failretval!=0]
+//sys	SetHandleInformation(handle Handle, mask uint32, flags uint32) (errno int)
+//sys	FlushFileBuffers(handle Handle) (errno int)
 //sys	GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, errno int) = kernel32.GetFullPathNameW
-//sys	CreateFileMapping(fhandle int32, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle int32, errno int) = kernel32.CreateFileMappingW
-//sys	MapViewOfFile(handle int32, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, errno int)
+//sys	CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, errno int) = kernel32.CreateFileMappingW
+//sys	MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, errno int)
 //sys	UnmapViewOfFile(addr uintptr) (errno int)
 //sys	FlushViewOfFile(addr uintptr, length uintptr) (errno int)
 //sys	VirtualLock(addr uintptr, length uintptr) (errno int)
 //sys	VirtualUnlock(addr uintptr, length uintptr) (errno int)
-//sys	TransmitFile(s int32, handle int32, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (errno int) = wsock32.TransmitFile
+//sys	TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (errno int) = wsock32.TransmitFile
 
 // syscall interface implementation for other packages
 
@@ -205,9 +209,9 @@ func makeInheritSa() *SecurityAttributes {
 	return &sa
 }
 
-func Open(path string, mode int, perm uint32) (fd int, errno int) {
+func Open(path string, mode int, perm uint32) (fd Handle, errno int) {
 	if len(path) == 0 {
-		return -1, ERROR_FILE_NOT_FOUND
+		return InvalidHandle, ERROR_FILE_NOT_FOUND
 	}
 	var access uint32
 	switch mode & (O_RDONLY | O_WRONLY | O_RDWR) {
@@ -244,12 +248,12 @@ func Open(path string, mode int, perm uint32) (fd int, errno int) {
 		createmode = OPEN_EXISTING
 	}
 	h, e := CreateFile(StringToUTF16Ptr(path), access, sharemode, sa, createmode, FILE_ATTRIBUTE_NORMAL, 0)
-	return int(h), int(e)
+	return h, int(e)
 }
 
-func Read(fd int, p []byte) (n int, errno int) {
+func Read(fd Handle, p []byte) (n int, errno int) {
 	var done uint32
-	e := ReadFile(int32(fd), p, &done, nil)
+	e := ReadFile(fd, p, &done, nil)
 	if e != 0 {
 		if e == ERROR_BROKEN_PIPE {
 			// NOTE(brainman): work around ERROR_BROKEN_PIPE is returned on reading EOF from stdin
@@ -260,16 +264,16 @@ func Read(fd int, p []byte) (n int, errno int) {
 	return int(done), 0
 }
 
-func Write(fd int, p []byte) (n int, errno int) {
+func Write(fd Handle, p []byte) (n int, errno int) {
 	var done uint32
-	e := WriteFile(int32(fd), p, &done, nil)
+	e := WriteFile(fd, p, &done, nil)
 	if e != 0 {
 		return 0, e
 	}
 	return int(done), 0
 }
 
-func Seek(fd int, offset int64, whence int) (newoffset int64, errno int) {
+func Seek(fd Handle, offset int64, whence int) (newoffset int64, errno int) {
 	var w uint32
 	switch whence {
 	case 0:
@@ -282,19 +286,19 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, errno int) {
 	hi := int32(offset >> 32)
 	lo := int32(offset)
 	// use GetFileType to check pipe, pipe can't do seek
-	ft, _ := GetFileType(uint32(fd))
+	ft, _ := GetFileType(fd)
 	if ft == FILE_TYPE_PIPE {
 		return 0, EPIPE
 	}
-	rlo, e := SetFilePointer(int32(fd), lo, &hi, w)
+	rlo, e := SetFilePointer(fd, lo, &hi, w)
 	if e != 0 {
 		return 0, e
 	}
 	return int64(hi)<<32 + int64(rlo), 0
 }
 
-func Close(fd int) (errno int) {
-	return CloseHandle(int32(fd))
+func Close(fd Handle) (errno int) {
+	return CloseHandle(fd)
 }
 
 var (
@@ -303,9 +307,9 @@ var (
 	Stderr = getStdHandle(STD_ERROR_HANDLE)
 )
 
-func getStdHandle(h int32) (fd int) {
+func getStdHandle(h int) (fd Handle) {
 	r, _ := GetStdHandle(h)
-	return int(r)
+	return r
 }
 
 func Stat(path string, stat *Stat_t) (errno int) {
@@ -384,7 +388,7 @@ func ComputerName() (name string, errno int) {
 	return string(utf16.Decode(b[0:n])), 0
 }
 
-func Ftruncate(fd int, length int64) (errno int) {
+func Ftruncate(fd Handle, length int64) (errno int) {
 	curoffset, e := Seek(fd, 0, 1)
 	if e != 0 {
 		return e
@@ -394,7 +398,7 @@ func Ftruncate(fd int, length int64) (errno int) {
 	if e != 0 {
 		return e
 	}
-	e = SetEndOfFile(int32(fd))
+	e = SetEndOfFile(fd)
 	if e != 0 {
 		return e
 	}
@@ -413,17 +417,17 @@ func Sleep(nsec int64) (errno int) {
 	return 0
 }
 
-func Pipe(p []int) (errno int) {
+func Pipe(p []Handle) (errno int) {
 	if len(p) != 2 {
 		return EINVAL
 	}
-	var r, w uint32
+	var r, w Handle
 	e := CreatePipe(&r, &w, makeInheritSa(), 0)
 	if e != 0 {
 		return e
 	}
-	p[0] = int(r)
-	p[1] = int(w)
+	p[0] = r
+	p[1] = w
 	return 0
 }
 
@@ -437,14 +441,14 @@ func Utimes(path string, tv []Timeval) (errno int) {
 	if e != 0 {
 		return e
 	}
-	defer Close(int(h))
+	defer Close(h)
 	a := NsecToFiletime(tv[0].Nanoseconds())
 	w := NsecToFiletime(tv[1].Nanoseconds())
 	return SetFileTime(h, nil, &a, &w)
 }
 
-func Fsync(fd int) (errno int) {
-	return FlushFileBuffers(int32(fd))
+func Fsync(fd Handle) (errno int) {
+	return FlushFileBuffers(fd)
 }
 
 func Chmod(path string, mode uint32) (errno int) {
@@ -468,22 +472,22 @@ func Chmod(path string, mode uint32) (errno int) {
 
 //sys	WSAStartup(verreq uint32, data *WSAData) (sockerrno int) = wsock32.WSAStartup
 //sys	WSACleanup() (errno int) [failretval==-1] = wsock32.WSACleanup
-//sys	WSAIoctl(s int32, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (errno int) [failretval==-1] = ws2_32.WSAIoctl
-//sys	socket(af int32, typ int32, protocol int32) (handle int32, errno int) [failretval==-1] = wsock32.socket
-//sys	setsockopt(s int32, level int32, optname int32, optval *byte, optlen int32) (errno int) [failretval==-1] = wsock32.setsockopt
-//sys	bind(s int32, name uintptr, namelen int32) (errno int) [failretval==-1] = wsock32.bind
-//sys	connect(s int32, name uintptr, namelen int32) (errno int) [failretval==-1] = wsock32.connect
-//sys	getsockname(s int32, rsa *RawSockaddrAny, addrlen *int32) (errno int) [failretval==-1] = wsock32.getsockname
-//sys	getpeername(s int32, rsa *RawSockaddrAny, addrlen *int32) (errno int) [failretval==-1] = wsock32.getpeername
-//sys	listen(s int32, backlog int32) (errno int) [failretval==-1] = wsock32.listen
-//sys	shutdown(s int32, how int32) (errno int) [failretval==-1] = wsock32.shutdown
-//sys	Closesocket(s int32) (errno int) [failretval==-1] = wsock32.closesocket
-//sys	AcceptEx(ls uint32, as uint32, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (errno int) = wsock32.AcceptEx
+//sys	WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (errno int) [failretval==-1] = ws2_32.WSAIoctl
+//sys	socket(af int32, typ int32, protocol int32) (handle Handle, errno int) [failretval==InvalidHandle] = wsock32.socket
+//sys	setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (errno int) [failretval==-1] = wsock32.setsockopt
+//sys	bind(s Handle, name uintptr, namelen int32) (errno int) [failretval==-1] = wsock32.bind
+//sys	connect(s Handle, name uintptr, namelen int32) (errno int) [failretval==-1] = wsock32.connect
+//sys	getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (errno int) [failretval==-1] = wsock32.getsockname
+//sys	getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (errno int) [failretval==-1] = wsock32.getpeername
+//sys	listen(s Handle, backlog int32) (errno int) [failretval==-1] = wsock32.listen
+//sys	shutdown(s Handle, how int32) (errno int) [failretval==-1] = wsock32.shutdown
+//sys	Closesocket(s Handle) (errno int) [failretval==-1] = wsock32.closesocket
+//sys	AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (errno int) = wsock32.AcceptEx
 //sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = wsock32.GetAcceptExSockaddrs
-//sys	WSARecv(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSARecv
-//sys	WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSASend
-//sys	WSARecvFrom(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32,  from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSARecvFrom
-//sys	WSASendTo(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32,  overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSASendTo
+//sys	WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSARecv
+//sys	WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSASend
+//sys	WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32,  from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSARecvFrom
+//sys	WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32,  overlapped *Overlapped, croutine *byte) (errno int) [failretval==-1] = ws2_32.WSASendTo
 //sys	GetHostByName(name string) (h *Hostent, errno int) [failretval==nil] = ws2_32.gethostbyname
 //sys	GetServByName(name string, proto string) (s *Servent, errno int) [failretval==nil] = ws2_32.getservbyname
 //sys	Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
@@ -578,62 +582,62 @@ func (rsa *RawSockaddrAny) Sockaddr() (Sockaddr, int) {
 	return nil, EAFNOSUPPORT
 }
 
-func Socket(domain, typ, proto int) (fd, errno int) {
+func Socket(domain, typ, proto int) (fd Handle, errno int) {
 	if domain == AF_INET6 && SocketDisableIPv6 {
-		return -1, EAFNOSUPPORT
+		return InvalidHandle, EAFNOSUPPORT
 	}
 	h, e := socket(int32(domain), int32(typ), int32(proto))
-	return int(h), int(e)
+	return h, int(e)
 }
 
-func SetsockoptInt(fd, level, opt int, value int) (errno int) {
+func SetsockoptInt(fd Handle, level, opt int, value int) (errno int) {
 	v := int32(value)
-	return int(setsockopt(int32(fd), int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))))
+	return int(setsockopt(fd, int32(level), int32(opt), (*byte)(unsafe.Pointer(&v)), int32(unsafe.Sizeof(v))))
 }
 
-func Bind(fd int, sa Sockaddr) (errno int) {
+func Bind(fd Handle, sa Sockaddr) (errno int) {
 	ptr, n, err := sa.sockaddr()
 	if err != 0 {
 		return err
 	}
-	return bind(int32(fd), ptr, n)
+	return bind(fd, ptr, n)
 }
 
-func Connect(fd int, sa Sockaddr) (errno int) {
+func Connect(fd Handle, sa Sockaddr) (errno int) {
 	ptr, n, err := sa.sockaddr()
 	if err != 0 {
 		return err
 	}
-	return connect(int32(fd), ptr, n)
+	return connect(fd, ptr, n)
 }
 
-func Getsockname(fd int) (sa Sockaddr, errno int) {
+func Getsockname(fd Handle) (sa Sockaddr, errno int) {
 	var rsa RawSockaddrAny
 	l := int32(unsafe.Sizeof(rsa))
-	if errno = getsockname(int32(fd), &rsa, &l); errno != 0 {
+	if errno = getsockname(fd, &rsa, &l); errno != 0 {
 		return
 	}
 	return rsa.Sockaddr()
 }
 
-func Getpeername(fd int) (sa Sockaddr, errno int) {
+func Getpeername(fd Handle) (sa Sockaddr, errno int) {
 	var rsa RawSockaddrAny
 	l := int32(unsafe.Sizeof(rsa))
-	if errno = getpeername(int32(fd), &rsa, &l); errno != 0 {
+	if errno = getpeername(fd, &rsa, &l); errno != 0 {
 		return
 	}
 	return rsa.Sockaddr()
 }
 
-func Listen(s int, n int) (errno int) {
-	return int(listen(int32(s), int32(n)))
+func Listen(s Handle, n int) (errno int) {
+	return int(listen(s, int32(n)))
 }
 
-func Shutdown(fd, how int) (errno int) {
-	return int(shutdown(int32(fd), int32(how)))
+func Shutdown(fd Handle, how int) (errno int) {
+	return int(shutdown(fd, int32(how)))
 }
 
-func WSASendto(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (errno int) {
+func WSASendto(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to Sockaddr, overlapped *Overlapped, croutine *byte) (errno int) {
 	rsa, l, err := to.sockaddr()
 	if err != 0 {
 		return err
@@ -670,10 +674,12 @@ func (w WaitStatus) TrapCause() int { return -1 }
 
 // TODO(brainman): fix all needed for net
 
-func Accept(fd int) (nfd int, sa Sockaddr, errno int)                        { return 0, nil, EWINDOWS }
-func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, errno int) { return 0, nil, EWINDOWS }
-func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int)            { return EWINDOWS }
-func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (errno int)          { return EWINDOWS }
+func Accept(fd Handle) (nfd Handle, sa Sockaddr, errno int) { return 0, nil, EWINDOWS }
+func Recvfrom(fd Handle, p []byte, flags int) (n int, from Sockaddr, errno int) {
+	return 0, nil, EWINDOWS
+}
+func Sendto(fd Handle, p []byte, flags int, to Sockaddr) (errno int)       { return EWINDOWS }
+func SetsockoptTimeval(fd Handle, level, opt int, tv *Timeval) (errno int) { return EWINDOWS }
 
 type Linger struct {
 	Onoff  int32
@@ -695,25 +701,25 @@ type IPv6Mreq struct {
 	Interface uint32
 }
 
-func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int)        { return EWINDOWS }
-func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (errno int)     { return EWINDOWS }
-func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (errno int) { return EWINDOWS }
-func BindToDevice(fd int, device string) (errno int)                    { return EWINDOWS }
+func SetsockoptLinger(fd Handle, level, opt int, l *Linger) (errno int)        { return EWINDOWS }
+func SetsockoptIPMreq(fd Handle, level, opt int, mreq *IPMreq) (errno int)     { return EWINDOWS }
+func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (errno int) { return EWINDOWS }
+func BindToDevice(fd Handle, device string) (errno int)                        { return EWINDOWS }
 
 // TODO(brainman): fix all needed for os
 
 func Getpid() (pid int)   { return -1 }
 func Getppid() (ppid int) { return -1 }
 
-func Fchdir(fd int) (errno int)                           { return EWINDOWS }
+func Fchdir(fd Handle) (errno int)                        { return EWINDOWS }
 func Link(oldpath, newpath string) (errno int)            { return EWINDOWS }
 func Symlink(path, link string) (errno int)               { return EWINDOWS }
 func Readlink(path string, buf []byte) (n int, errno int) { return 0, EWINDOWS }
 
-func Fchmod(fd int, mode uint32) (errno int)           { return EWINDOWS }
+func Fchmod(fd Handle, mode uint32) (errno int)        { return EWINDOWS }
 func Chown(path string, uid int, gid int) (errno int)  { return EWINDOWS }
 func Lchown(path string, uid int, gid int) (errno int) { return EWINDOWS }
-func Fchown(fd int, uid int, gid int) (errno int)      { return EWINDOWS }
+func Fchown(fd Handle, uid int, gid int) (errno int)   { return EWINDOWS }
 
 func Getuid() (uid int)                  { return -1 }
 func Geteuid() (euid int)                { return -1 }
@@ -723,11 +729,11 @@ func Getgroups() (gids []int, errno int) { return nil, EWINDOWS }
 
 // TODO(brainman): fix all this meaningless code, it is here to compile exec.go
 
-func read(fd int, buf *byte, nbuf int) (n int, errno int) {
+func read(fd Handle, buf *byte, nbuf int) (n int, errno int) {
 	return 0, EWINDOWS
 }
 
-func fcntl(fd, cmd, arg int) (val int, errno int) {
+func fcntl(fd Handle, cmd, arg int) (val int, errno int) {
 	return 0, EWINDOWS
 }
 
diff --git a/src/pkg/syscall/zsyscall_windows_386.go b/src/pkg/syscall/zsyscall_windows_386.go
index fd28d338cc0cd2682794e6bd7c425809a1e49388..8bf8db81a8e1f28a2144d60a0758393651188f6e 100644
--- a/src/pkg/syscall/zsyscall_windows_386.go
+++ b/src/pkg/syscall/zsyscall_windows_386.go
@@ -112,9 +112,9 @@ func GetLastError() (lasterrno int) {
 	return
 }
 
-func LoadLibrary(libname string) (handle uint32, errno int) {
+func LoadLibrary(libname string) (handle Handle, errno int) {
 	r0, _, e1 := Syscall(procLoadLibraryW, 1, uintptr(unsafe.Pointer(StringToUTF16Ptr(libname))), 0, 0)
-	handle = uint32(r0)
+	handle = Handle(r0)
 	if handle == 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -127,7 +127,7 @@ func LoadLibrary(libname string) (handle uint32, errno int) {
 	return
 }
 
-func FreeLibrary(handle uint32) (errno int) {
+func FreeLibrary(handle Handle) (errno int) {
 	r1, _, e1 := Syscall(procFreeLibrary, 1, uintptr(handle), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -141,9 +141,9 @@ func FreeLibrary(handle uint32) (errno int) {
 	return
 }
 
-func GetProcAddress(module uint32, procname string) (proc uint32, errno int) {
+func GetProcAddress(module Handle, procname string) (proc Handle, errno int) {
 	r0, _, e1 := Syscall(procGetProcAddress, 2, uintptr(module), uintptr(unsafe.Pointer(StringBytePtr(procname))), 0)
-	proc = uint32(r0)
+	proc = Handle(r0)
 	if proc == 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -195,10 +195,10 @@ func ExitProcess(exitcode uint32) {
 	return
 }
 
-func CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle int32, errno int) {
+func CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, errno int) {
 	r0, _, e1 := Syscall9(procCreateFileW, 7, uintptr(unsafe.Pointer(name)), uintptr(access), uintptr(mode), uintptr(unsafe.Pointer(sa)), uintptr(createmode), uintptr(attrs), uintptr(templatefile), 0, 0)
-	handle = int32(r0)
-	if handle == -1 {
+	handle = Handle(r0)
+	if handle == InvalidHandle {
 		if e1 != 0 {
 			errno = int(e1)
 		} else {
@@ -210,7 +210,7 @@ func CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes
 	return
 }
 
-func ReadFile(handle int32, buf []byte, done *uint32, overlapped *Overlapped) (errno int) {
+func ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (errno int) {
 	var _p0 *byte
 	if len(buf) > 0 {
 		_p0 = &buf[0]
@@ -228,7 +228,7 @@ func ReadFile(handle int32, buf []byte, done *uint32, overlapped *Overlapped) (e
 	return
 }
 
-func WriteFile(handle int32, buf []byte, done *uint32, overlapped *Overlapped) (errno int) {
+func WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (errno int) {
 	var _p0 *byte
 	if len(buf) > 0 {
 		_p0 = &buf[0]
@@ -246,7 +246,7 @@ func WriteFile(handle int32, buf []byte, done *uint32, overlapped *Overlapped) (
 	return
 }
 
-func SetFilePointer(handle int32, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, errno int) {
+func SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, errno int) {
 	r0, _, e1 := Syscall6(procSetFilePointer, 4, uintptr(handle), uintptr(lowoffset), uintptr(unsafe.Pointer(highoffsetptr)), uintptr(whence), 0, 0)
 	newlowoffset = uint32(r0)
 	if newlowoffset == 0xffffffff {
@@ -261,7 +261,7 @@ func SetFilePointer(handle int32, lowoffset int32, highoffsetptr *int32, whence
 	return
 }
 
-func CloseHandle(handle int32) (errno int) {
+func CloseHandle(handle Handle) (errno int) {
 	r1, _, e1 := Syscall(procCloseHandle, 1, uintptr(handle), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -275,10 +275,10 @@ func CloseHandle(handle int32) (errno int) {
 	return
 }
 
-func GetStdHandle(stdhandle int32) (handle int32, errno int) {
+func GetStdHandle(stdhandle int) (handle Handle, errno int) {
 	r0, _, e1 := Syscall(procGetStdHandle, 1, uintptr(stdhandle), 0, 0)
-	handle = int32(r0)
-	if handle == -1 {
+	handle = Handle(r0)
+	if handle == InvalidHandle {
 		if e1 != 0 {
 			errno = int(e1)
 		} else {
@@ -290,10 +290,10 @@ func GetStdHandle(stdhandle int32) (handle int32, errno int) {
 	return
 }
 
-func FindFirstFile(name *uint16, data *Win32finddata) (handle int32, errno int) {
+func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, errno int) {
 	r0, _, e1 := Syscall(procFindFirstFileW, 2, uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(data)), 0)
-	handle = int32(r0)
-	if handle == -1 {
+	handle = Handle(r0)
+	if handle == InvalidHandle {
 		if e1 != 0 {
 			errno = int(e1)
 		} else {
@@ -305,7 +305,7 @@ func FindFirstFile(name *uint16, data *Win32finddata) (handle int32, errno int)
 	return
 }
 
-func FindNextFile(handle int32, data *Win32finddata) (errno int) {
+func FindNextFile(handle Handle, data *Win32finddata) (errno int) {
 	r1, _, e1 := Syscall(procFindNextFileW, 2, uintptr(handle), uintptr(unsafe.Pointer(data)), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -319,7 +319,7 @@ func FindNextFile(handle int32, data *Win32finddata) (errno int) {
 	return
 }
 
-func FindClose(handle int32) (errno int) {
+func FindClose(handle Handle) (errno int) {
 	r1, _, e1 := Syscall(procFindClose, 1, uintptr(handle), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -333,7 +333,7 @@ func FindClose(handle int32) (errno int) {
 	return
 }
 
-func GetFileInformationByHandle(handle int32, data *ByHandleFileInformation) (errno int) {
+func GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (errno int) {
 	r1, _, e1 := Syscall(procGetFileInformationByHandle, 2, uintptr(handle), uintptr(unsafe.Pointer(data)), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -446,7 +446,7 @@ func GetComputerName(buf *uint16, n *uint32) (errno int) {
 	return
 }
 
-func SetEndOfFile(handle int32) (errno int) {
+func SetEndOfFile(handle Handle) (errno int) {
 	r1, _, e1 := Syscall(procSetEndOfFile, 1, uintptr(handle), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -485,9 +485,9 @@ func GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, errno int) {
 	return
 }
 
-func CreateIoCompletionPort(filehandle int32, cphandle int32, key uint32, threadcnt uint32) (handle int32, errno int) {
+func CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (handle Handle, errno int) {
 	r0, _, e1 := Syscall6(procCreateIoCompletionPort, 4, uintptr(filehandle), uintptr(cphandle), uintptr(key), uintptr(threadcnt), 0, 0)
-	handle = int32(r0)
+	handle = Handle(r0)
 	if handle == 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -500,7 +500,7 @@ func CreateIoCompletionPort(filehandle int32, cphandle int32, key uint32, thread
 	return
 }
 
-func GetQueuedCompletionStatus(cphandle int32, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (errno int) {
+func GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) (errno int) {
 	r1, _, e1 := Syscall6(procGetQueuedCompletionStatus, 5, uintptr(cphandle), uintptr(unsafe.Pointer(qty)), uintptr(unsafe.Pointer(key)), uintptr(unsafe.Pointer(overlapped)), uintptr(timeout), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -514,7 +514,7 @@ func GetQueuedCompletionStatus(cphandle int32, qty *uint32, key *uint32, overlap
 	return
 }
 
-func CancelIo(s uint32) (errno int) {
+func CancelIo(s Handle) (errno int) {
 	r1, _, e1 := Syscall(procCancelIo, 1, uintptr(s), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -548,7 +548,7 @@ func CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityA
 	return
 }
 
-func OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle int32, errno int) {
+func OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, errno int) {
 	var _p0 uint32
 	if inheritHandle {
 		_p0 = 1
@@ -556,7 +556,7 @@ func OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle int32, errno
 		_p0 = 0
 	}
 	r0, _, e1 := Syscall(procOpenProcess, 3, uintptr(da), uintptr(_p0), uintptr(pid))
-	handle = int32(r0)
+	handle = Handle(r0)
 	if handle == 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -569,7 +569,7 @@ func OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle int32, errno
 	return
 }
 
-func TerminateProcess(handle int32, exitcode uint32) (errno int) {
+func TerminateProcess(handle Handle, exitcode uint32) (errno int) {
 	r1, _, e1 := Syscall(procTerminateProcess, 2, uintptr(handle), uintptr(exitcode), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -583,7 +583,7 @@ func TerminateProcess(handle int32, exitcode uint32) (errno int) {
 	return
 }
 
-func GetExitCodeProcess(handle int32, exitcode *uint32) (errno int) {
+func GetExitCodeProcess(handle Handle, exitcode *uint32) (errno int) {
 	r1, _, e1 := Syscall(procGetExitCodeProcess, 2, uintptr(handle), uintptr(unsafe.Pointer(exitcode)), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -611,9 +611,9 @@ func GetStartupInfo(startupInfo *StartupInfo) (errno int) {
 	return
 }
 
-func GetCurrentProcess() (pseudoHandle int32, errno int) {
+func GetCurrentProcess() (pseudoHandle Handle, errno int) {
 	r0, _, e1 := Syscall(procGetCurrentProcess, 0, 0, 0, 0)
-	pseudoHandle = int32(r0)
+	pseudoHandle = Handle(r0)
 	if pseudoHandle == 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -626,7 +626,7 @@ func GetCurrentProcess() (pseudoHandle int32, errno int) {
 	return
 }
 
-func DuplicateHandle(hSourceProcessHandle int32, hSourceHandle int32, hTargetProcessHandle int32, lpTargetHandle *int32, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (errno int) {
+func DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (errno int) {
 	var _p0 uint32
 	if bInheritHandle {
 		_p0 = 1
@@ -646,7 +646,7 @@ func DuplicateHandle(hSourceProcessHandle int32, hSourceHandle int32, hTargetPro
 	return
 }
 
-func WaitForSingleObject(handle int32, waitMilliseconds uint32) (event uint32, errno int) {
+func WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, errno int) {
 	r0, _, e1 := Syscall(procWaitForSingleObject, 2, uintptr(handle), uintptr(waitMilliseconds), 0)
 	event = uint32(r0)
 	if event == 0xffffffff {
@@ -676,7 +676,7 @@ func GetTempPath(buflen uint32, buf *uint16) (n uint32, errno int) {
 	return
 }
 
-func CreatePipe(readhandle *uint32, writehandle *uint32, sa *SecurityAttributes, size uint32) (errno int) {
+func CreatePipe(readhandle *Handle, writehandle *Handle, sa *SecurityAttributes, size uint32) (errno int) {
 	r1, _, e1 := Syscall6(procCreatePipe, 4, uintptr(unsafe.Pointer(readhandle)), uintptr(unsafe.Pointer(writehandle)), uintptr(unsafe.Pointer(sa)), uintptr(size), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -690,7 +690,7 @@ func CreatePipe(readhandle *uint32, writehandle *uint32, sa *SecurityAttributes,
 	return
 }
 
-func GetFileType(filehandle uint32) (n uint32, errno int) {
+func GetFileType(filehandle Handle) (n uint32, errno int) {
 	r0, _, e1 := Syscall(procGetFileType, 1, uintptr(filehandle), 0, 0)
 	n = uint32(r0)
 	if n == 0 {
@@ -705,7 +705,7 @@ func GetFileType(filehandle uint32) (n uint32, errno int) {
 	return
 }
 
-func CryptAcquireContext(provhandle *uint32, container *uint16, provider *uint16, provtype uint32, flags uint32) (errno int) {
+func CryptAcquireContext(provhandle *Handle, container *uint16, provider *uint16, provtype uint32, flags uint32) (errno int) {
 	r1, _, e1 := Syscall6(procCryptAcquireContextW, 5, uintptr(unsafe.Pointer(provhandle)), uintptr(unsafe.Pointer(container)), uintptr(unsafe.Pointer(provider)), uintptr(provtype), uintptr(flags), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -719,7 +719,7 @@ func CryptAcquireContext(provhandle *uint32, container *uint16, provider *uint16
 	return
 }
 
-func CryptReleaseContext(provhandle uint32, flags uint32) (errno int) {
+func CryptReleaseContext(provhandle Handle, flags uint32) (errno int) {
 	r1, _, e1 := Syscall(procCryptReleaseContext, 2, uintptr(provhandle), uintptr(flags), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -733,7 +733,7 @@ func CryptReleaseContext(provhandle uint32, flags uint32) (errno int) {
 	return
 }
 
-func CryptGenRandom(provhandle uint32, buflen uint32, buf *byte) (errno int) {
+func CryptGenRandom(provhandle Handle, buflen uint32, buf *byte) (errno int) {
 	r1, _, e1 := Syscall(procCryptGenRandom, 3, uintptr(provhandle), uintptr(buflen), uintptr(unsafe.Pointer(buf)))
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -805,7 +805,7 @@ func SetEnvironmentVariable(name *uint16, value *uint16) (errno int) {
 	return
 }
 
-func SetFileTime(handle int32, ctime *Filetime, atime *Filetime, wtime *Filetime) (errno int) {
+func SetFileTime(handle Handle, ctime *Filetime, atime *Filetime, wtime *Filetime) (errno int) {
 	r1, _, e1 := Syscall6(procSetFileTime, 4, uintptr(handle), uintptr(unsafe.Pointer(ctime)), uintptr(unsafe.Pointer(atime)), uintptr(unsafe.Pointer(wtime)), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -869,9 +869,9 @@ func CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err
 	return
 }
 
-func LocalFree(hmem uint32) (handle uint32, errno int) {
+func LocalFree(hmem Handle) (handle Handle, errno int) {
 	r0, _, e1 := Syscall(procLocalFree, 1, uintptr(hmem), 0, 0)
-	handle = uint32(r0)
+	handle = Handle(r0)
 	if handle != 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -884,7 +884,7 @@ func LocalFree(hmem uint32) (handle uint32, errno int) {
 	return
 }
 
-func SetHandleInformation(handle int32, mask uint32, flags uint32) (errno int) {
+func SetHandleInformation(handle Handle, mask uint32, flags uint32) (errno int) {
 	r1, _, e1 := Syscall(procSetHandleInformation, 3, uintptr(handle), uintptr(mask), uintptr(flags))
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -898,7 +898,7 @@ func SetHandleInformation(handle int32, mask uint32, flags uint32) (errno int) {
 	return
 }
 
-func FlushFileBuffers(handle int32) (errno int) {
+func FlushFileBuffers(handle Handle) (errno int) {
 	r1, _, e1 := Syscall(procFlushFileBuffers, 1, uintptr(handle), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -927,9 +927,9 @@ func GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (
 	return
 }
 
-func CreateFileMapping(fhandle int32, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle int32, errno int) {
+func CreateFileMapping(fhandle Handle, sa *SecurityAttributes, prot uint32, maxSizeHigh uint32, maxSizeLow uint32, name *uint16) (handle Handle, errno int) {
 	r0, _, e1 := Syscall6(procCreateFileMappingW, 6, uintptr(fhandle), uintptr(unsafe.Pointer(sa)), uintptr(prot), uintptr(maxSizeHigh), uintptr(maxSizeLow), uintptr(unsafe.Pointer(name)))
-	handle = int32(r0)
+	handle = Handle(r0)
 	if handle == 0 {
 		if e1 != 0 {
 			errno = int(e1)
@@ -942,7 +942,7 @@ func CreateFileMapping(fhandle int32, sa *SecurityAttributes, prot uint32, maxSi
 	return
 }
 
-func MapViewOfFile(handle int32, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, errno int) {
+func MapViewOfFile(handle Handle, access uint32, offsetHigh uint32, offsetLow uint32, length uintptr) (addr uintptr, errno int) {
 	r0, _, e1 := Syscall6(procMapViewOfFile, 5, uintptr(handle), uintptr(access), uintptr(offsetHigh), uintptr(offsetLow), uintptr(length), 0)
 	addr = uintptr(r0)
 	if addr == 0 {
@@ -1013,7 +1013,7 @@ func VirtualUnlock(addr uintptr, length uintptr) (errno int) {
 	return
 }
 
-func TransmitFile(s int32, handle int32, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (errno int) {
+func TransmitFile(s Handle, handle Handle, bytesToWrite uint32, bytsPerSend uint32, overlapped *Overlapped, transmitFileBuf *TransmitFileBuffers, flags uint32) (errno int) {
 	r1, _, e1 := Syscall9(procTransmitFile, 7, uintptr(s), uintptr(handle), uintptr(bytesToWrite), uintptr(bytsPerSend), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(transmitFileBuf)), uintptr(flags), 0, 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -1047,7 +1047,7 @@ func WSACleanup() (errno int) {
 	return
 }
 
-func WSAIoctl(s int32, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (errno int) {
+func WSAIoctl(s Handle, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *Overlapped, completionRoutine uintptr) (errno int) {
 	r1, _, e1 := Syscall9(procWSAIoctl, 9, uintptr(s), uintptr(iocc), uintptr(unsafe.Pointer(inbuf)), uintptr(cbif), uintptr(unsafe.Pointer(outbuf)), uintptr(cbob), uintptr(unsafe.Pointer(cbbr)), uintptr(unsafe.Pointer(overlapped)), uintptr(completionRoutine))
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1061,10 +1061,10 @@ func WSAIoctl(s int32, iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob
 	return
 }
 
-func socket(af int32, typ int32, protocol int32) (handle int32, errno int) {
+func socket(af int32, typ int32, protocol int32) (handle Handle, errno int) {
 	r0, _, e1 := Syscall(procsocket, 3, uintptr(af), uintptr(typ), uintptr(protocol))
-	handle = int32(r0)
-	if handle == -1 {
+	handle = Handle(r0)
+	if handle == InvalidHandle {
 		if e1 != 0 {
 			errno = int(e1)
 		} else {
@@ -1076,7 +1076,7 @@ func socket(af int32, typ int32, protocol int32) (handle int32, errno int) {
 	return
 }
 
-func setsockopt(s int32, level int32, optname int32, optval *byte, optlen int32) (errno int) {
+func setsockopt(s Handle, level int32, optname int32, optval *byte, optlen int32) (errno int) {
 	r1, _, e1 := Syscall6(procsetsockopt, 5, uintptr(s), uintptr(level), uintptr(optname), uintptr(unsafe.Pointer(optval)), uintptr(optlen), 0)
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1090,7 +1090,7 @@ func setsockopt(s int32, level int32, optname int32, optval *byte, optlen int32)
 	return
 }
 
-func bind(s int32, name uintptr, namelen int32) (errno int) {
+func bind(s Handle, name uintptr, namelen int32) (errno int) {
 	r1, _, e1 := Syscall(procbind, 3, uintptr(s), uintptr(name), uintptr(namelen))
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1104,7 +1104,7 @@ func bind(s int32, name uintptr, namelen int32) (errno int) {
 	return
 }
 
-func connect(s int32, name uintptr, namelen int32) (errno int) {
+func connect(s Handle, name uintptr, namelen int32) (errno int) {
 	r1, _, e1 := Syscall(procconnect, 3, uintptr(s), uintptr(name), uintptr(namelen))
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1118,7 +1118,7 @@ func connect(s int32, name uintptr, namelen int32) (errno int) {
 	return
 }
 
-func getsockname(s int32, rsa *RawSockaddrAny, addrlen *int32) (errno int) {
+func getsockname(s Handle, rsa *RawSockaddrAny, addrlen *int32) (errno int) {
 	r1, _, e1 := Syscall(procgetsockname, 3, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1132,7 +1132,7 @@ func getsockname(s int32, rsa *RawSockaddrAny, addrlen *int32) (errno int) {
 	return
 }
 
-func getpeername(s int32, rsa *RawSockaddrAny, addrlen *int32) (errno int) {
+func getpeername(s Handle, rsa *RawSockaddrAny, addrlen *int32) (errno int) {
 	r1, _, e1 := Syscall(procgetpeername, 3, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1146,7 +1146,7 @@ func getpeername(s int32, rsa *RawSockaddrAny, addrlen *int32) (errno int) {
 	return
 }
 
-func listen(s int32, backlog int32) (errno int) {
+func listen(s Handle, backlog int32) (errno int) {
 	r1, _, e1 := Syscall(proclisten, 2, uintptr(s), uintptr(backlog), 0)
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1160,7 +1160,7 @@ func listen(s int32, backlog int32) (errno int) {
 	return
 }
 
-func shutdown(s int32, how int32) (errno int) {
+func shutdown(s Handle, how int32) (errno int) {
 	r1, _, e1 := Syscall(procshutdown, 2, uintptr(s), uintptr(how), 0)
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1174,7 +1174,7 @@ func shutdown(s int32, how int32) (errno int) {
 	return
 }
 
-func Closesocket(s int32) (errno int) {
+func Closesocket(s Handle) (errno int) {
 	r1, _, e1 := Syscall(procclosesocket, 1, uintptr(s), 0, 0)
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1188,7 +1188,7 @@ func Closesocket(s int32) (errno int) {
 	return
 }
 
-func AcceptEx(ls uint32, as uint32, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (errno int) {
+func AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (errno int) {
 	r1, _, e1 := Syscall9(procAcceptEx, 8, uintptr(ls), uintptr(as), uintptr(unsafe.Pointer(buf)), uintptr(rxdatalen), uintptr(laddrlen), uintptr(raddrlen), uintptr(unsafe.Pointer(recvd)), uintptr(unsafe.Pointer(overlapped)), 0)
 	if int(r1) == 0 {
 		if e1 != 0 {
@@ -1207,7 +1207,7 @@ func GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen
 	return
 }
 
-func WSARecv(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (errno int) {
+func WSARecv(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (errno int) {
 	r1, _, e1 := Syscall9(procWSARecv, 7, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(recvd)), uintptr(unsafe.Pointer(flags)), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)), 0, 0)
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1221,7 +1221,7 @@ func WSARecv(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32
 	return
 }
 
-func WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (errno int) {
+func WSASend(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (errno int) {
 	r1, _, e1 := Syscall9(procWSASend, 7, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)), 0, 0)
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1235,7 +1235,7 @@ func WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32,
 	return
 }
 
-func WSARecvFrom(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (errno int) {
+func WSARecvFrom(s Handle, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, from *RawSockaddrAny, fromlen *int32, overlapped *Overlapped, croutine *byte) (errno int) {
 	r1, _, e1 := Syscall9(procWSARecvFrom, 9, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(recvd)), uintptr(unsafe.Pointer(flags)), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
 	if int(r1) == -1 {
 		if e1 != 0 {
@@ -1249,7 +1249,7 @@ func WSARecvFrom(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *ui
 	return
 }
 
-func WSASendTo(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (errno int) {
+func WSASendTo(s Handle, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, to *RawSockaddrAny, tolen int32, overlapped *Overlapped, croutine *byte) (errno int) {
 	r1, _, e1 := Syscall9(procWSASendTo, 9, uintptr(s), uintptr(unsafe.Pointer(bufs)), uintptr(bufcnt), uintptr(unsafe.Pointer(sent)), uintptr(flags), uintptr(unsafe.Pointer(to)), uintptr(tolen), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
 	if int(r1) == -1 {
 		if e1 != 0 {
diff --git a/src/pkg/syscall/ztypes_windows_386.go b/src/pkg/syscall/ztypes_windows_386.go
index 6ea85e2b8dadeb42330531ebde547b1fa91991b3..1a264a405f9fa4597a2f3617ce1cce454872e384 100644
--- a/src/pkg/syscall/ztypes_windows_386.go
+++ b/src/pkg/syscall/ztypes_windows_386.go
@@ -216,7 +216,7 @@ type Overlapped struct {
 	InternalHigh uint32
 	Offset       uint32
 	OffsetHigh   uint32
-	HEvent       int32
+	HEvent       Handle
 }
 
 type Filetime struct {
@@ -306,14 +306,14 @@ type StartupInfo struct {
 	ShowWindow    uint16
 	_             uint16
 	_             *byte
-	StdInput      int32
-	StdOutput     int32
-	StdErr        int32
+	StdInput      Handle
+	StdOutput     Handle
+	StdErr        Handle
 }
 
 type ProcessInformation struct {
-	Process   int32
-	Thread    int32
+	Process   Handle
+	Thread    Handle
 	ProcessId uint32
 	ThreadId  uint32
 }