diff -r b6b8a2171aa3 Lib/test/support/__init__.py
--- a/Lib/test/support/__init__.py	Fri Sep 06 15:16:19 2013 -0700
+++ b/Lib/test/support/__init__.py	Fri Sep 06 22:33:13 2013 -0500
@@ -914,7 +914,7 @@
 
     filename = urllib.parse.urlparse(url)[2].split('/')[-1] # '/': it's URL!
 
-    fn = os.path.join(os.path.dirname(__file__), "data", filename)
+    fn = os.path.join(os.path.dirname(__file__), os.path.pardir, "data", filename)
 
     def check_valid_file(fn):
         f = open(fn, *args, **kw)