--- browse-url.el.orig	2009-11-21 12:33:40.000000000 -0500
+++ browse-url.el	2009-11-22 07:38:25.890761600 -0500
@@ -699,6 +699,10 @@
 (defun browse-url-file-url (file)
   "Return the URL corresponding to FILE.
 Use variable `browse-url-filename-alist' to map filenames to URLs."
+  (if (eq system-type 'cygwin)
+      (let ((winfile (with-output-to-string
+              (call-process "cygpath" nil standard-output nil "-m" file))))
+	(setq file (concat "file://" (substring winfile 0 -1)))))
   (let ((coding (and (default-value 'enable-multibyte-characters)
 		     (or file-name-coding-system
 			 default-file-name-coding-system))))