new file mode 100644
--- /dev/null
+++ b/src/os/win32/ngx_sendfile.c
@@ -0,0 +1,89 @@
+
+#include <ngx_config.h>
+#include <ngx_types.h>
+#include <ngx_errno.h>
+#include <ngx_log.h>
+#include <ngx_sendv.h>
+#include <ngx_sendfile.h>
+
+/*
+  TODO:
+       various flags
+       TransmitPackets
+*/
+
+/*
+  returns
+      0 done
+     -1 error
+*/
+
+#if (HAVE_WIN32_TRANSMITFILE)
+
+int ngx_sendfile(ngx_socket_t s,
+                 ngx_iovec_t *headers, int hdr_cnt,
+                 ngx_file_t fd, off_t offset, size_t nbytes,
+                 ngx_iovec_t *trailers, int trl_cnt,
+                 off_t *sent,
+                 ngx_log_t *log)
+{
+    int                    tfrc, rc;
+    ngx_err_t              tf_err, err;
+    OVERLAPPED             olp;
+    TRANSMIT_FILE_BUFFERS  tfb, *ptfb;
+
+    tf_err = 0;
+    err = 0;
+
+    olp.Internal = 0;
+    olp.InternalHigh = 0;
+    olp.Offset = (DWORD) offset;
+    olp.OffsetHigh = (DWORD) (offset >> 32);
+    olp.hEvent = NULL;
+
+    if (headers || trailers) {
+        tfb.Head = headers->ngx_iov_base;
+        tfb.HeadLength = headers->ngx_iov_len;
+        tfb.Tail = trailers->ngx_iov_base;
+        tfb.TailLength = trailers->ngx_iov_len;
+        ptfb = &tfb;
+
+    } else {
+        ptfb = NULL;
+    }
+
+    tfrc = TransmitFile(s, fd, nbytes, 0, &olp, ptfb, 0);
+
+    if (tfrc == 0)
+        tf_err = ngx_socket_errno;
+
+    /* set sent */
+    rc = WSAGetOverlappedResult(s, &olp, (unsigned long *) sent, 0, NULL);
+
+    ngx_log_debug(log, "ngx_sendfile: %d, @%qd %d:%qd" _
+                  tfrc _ offset _ nbytes _ *sent);
+
+    if (rc == 0) {
+        err = ngx_socket_errno;
+        ngx_log_error(NGX_LOG_ERR, log, err,
+                     "ngx_sendfile: WSAGetOverlappedResult failed");
+    }
+
+    if (tfrc == 0) {
+        if (tf_err != NGX_EAGAIN) {
+            ngx_log_error(NGX_LOG_ERR, log, tf_err,
+                          "ngx_sendfile: TransmitFile failed");
+            return -1;
+        }
+
+        ngx_log_error(NGX_LOG_INFO, log, tf_err,
+                     "ngx_sendfile: TransmitFile sent only %qd bytes", *sent);
+    }
+
+    if (rc == 0)
+        return -1;
+
+    return 0;
+}
+
+#endif