Index: Lib/mimetypes.py
===================================================================
--- Lib/mimetypes.py	(revision 86639)
+++ Lib/mimetypes.py	(working copy)
@@ -245,10 +245,6 @@
                     ctype = _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