Index: release27-maint/Lib/mimetypes.py
===================================================================
--- release27-maint/Lib/mimetypes.py	(revision 86639)
+++ release27-maint/Lib/mimetypes.py	(working copy)
@@ -245,12 +245,7 @@
                     ctype = _winreg.EnumKey(mimedb, i)
                 except EnvironmentError:
                     break
-                try:
-                    ctype = ctype.encode(default_encoding) # omit in 3.x!
-                except UnicodeEncodeError:
-                    pass
-                else:
-                    yield ctype
+                yield ctype
                 i += 1
 
         default_encoding = sys.getdefaultencoding()