Index: Lib/mimetypes.py
===================================================================
--- Lib/mimetypes.py	(revision 85786)
+++ Lib/mimetypes.py	(working copy)
@@ -27,6 +27,7 @@
 import sys
 import posixpath
 import urllib
+from itertools import count
 try:
     import _winreg
 except ImportError:
@@ -239,19 +240,11 @@
             return
 
         def enum_types(mimedb):
-            i = 0
-            while True:
+            for i in count():
                 try:
-                    ctype = _winreg.EnumKey(mimedb, i)
+                    yield _winreg.EnumKey(mimedb, i)
                 except EnvironmentError:
                     break
-                try:
-                    ctype = ctype.encode(default_encoding) # omit in 3.x!
-                except UnicodeEncodeError:
-                    pass
-                else:
-                    yield ctype
-                i += 1
 
         default_encoding = sys.getdefaultencoding()
         with _winreg.OpenKey(_winreg.HKEY_CLASSES_ROOT,