diff -r 24179f82b7de Lib/nturl2path.py
--- a/Lib/nturl2path.py	Tue Mar 22 23:47:32 2011 +0100
+++ b/Lib/nturl2path.py	Sun Mar 27 14:33:07 2011 -0700
@@ -25,11 +25,14 @@
         error = 'Bad URL: ' + url
         raise IOError, error
     drive = comp[0][-1].upper()
+    path = drive + ':'
     components = comp[1].split('/')
-    path = drive + ':'
-    for  comp in components:
+    for comp in components:
         if comp:
             path = path + '\\' + urllib.unquote(comp)
+    # Issue #11474: url like '/C|/' should convert into 'C:\\'
+    if path.endswith(':') and url.endswith('/'):
+        path += '\\'
     return path
 
 def pathname2url(p):
diff -r 24179f82b7de Lib/test/test_urllib.py
--- a/Lib/test/test_urllib.py	Tue Mar 22 23:47:32 2011 +0100
+++ b/Lib/test/test_urllib.py	Sun Mar 27 14:33:07 2011 -0700
@@ -5,6 +5,7 @@
 import unittest
 from test import test_support
 import os
+import sys
 import mimetools
 import tempfile
 import StringIO
@@ -606,6 +607,26 @@
                          "url2pathname() failed; %s != %s" %
                          (expect, result))
 
+    @unittest.skipUnless(sys.platform == 'win32',
+                         'test specific to the nturl2path library')
+    def test_ntpath(self):
+        from nturl2path import url2pathname
+
+        given = ('/C:/', '///C:/', '/C|//')
+        expect = 'C:\\'
+        for url in given:
+            result = url2pathname(url)
+            self.assertEqual(expect, result,
+                             'nturl2path.url2pathname() failed; %s != %s' %
+                             (expect, result))
+
+        given = '///C|/path'
+        expect = 'C:\\path'
+        result = url2pathname(given)
+        self.assertEqual(expect, result,
+                         'nturl2path.url2pathname() failed; %s != %s' %
+                         (expect, result))
+
 class Utility_Tests(unittest.TestCase):
     """Testcase to test the various utility functions in the urllib."""