Index: socket.php
===================================================================
--- socket.php	(revision 14184)
+++ socket.php	(working copy)
@@ -266,7 +266,7 @@
 	            return $this->raiseError('not connected');
 	        }
 
-	        if (is_null($blocksize) && !OS_WINDOWS) {
+	        if (is_null($blocksize) && (substr(PHP_OS, 0, 3) != 'WIN')) {
 	            return fwrite($this->fp, $data);
 	        } else {
 	            if (is_null($blocksize)) {