diff --git a/src/pkg/net/sendfile_windows.go b/src/pkg/net/sendfile_windows.go
new file mode 100644
index 0000000..34abc54
--- /dev/null
+++ b/src/pkg/net/sendfile_windows.go
@@ -0,0 +1,68 @@
+// Copyright 2011 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 net
+
+import (
+	"io"
+	"os"
+	"syscall"
+)
+
+type sendfileOp struct {
+	anOp
+	src int32 // 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)
+}
+
+func (o *sendfileOp) Name() string {
+	return "TransmitFile"
+}
+
+// sendFile copies the contents of r to c using the TransmitFile
+// system call to minimize copies.
+//
+// if handled == true, sendFile returns the number of bytes copied and any
+// non-EOF error.
+//
+// if handled == false, sendFile performed no work.
+//
+// Note that sendfile for windows does not suppport >2GB file.
+func sendFile(c *netFD, r io.Reader) (written int64, err os.Error, handled bool) {
+	var n int64 = 0 // by default, copy until EOF
+
+	lr, ok := r.(*io.LimitedReader)
+	if ok {
+		n, r = lr.N, lr.R
+		if n <= 0 {
+			return 0, nil, true
+		}
+	}
+	f, ok := r.(*os.File)
+	if !ok {
+		return 0, nil, false
+	}
+
+	c.wio.Lock()
+	defer c.wio.Unlock()
+	c.incref()
+	defer c.decref()
+
+	var o sendfileOp
+	o.Init(c)
+	o.n = uint32(n)
+	o.src = int32(f.Fd())
+	done, err := iosrv.ExecIO(&o, 0)
+	if err != nil {
+		return 0, err, false
+	}
+	if lr != nil {
+		lr.N -= int64(done)
+	}
+	return int64(done), nil, true
+}