--- c:/py/Lib/distutils/command/bdist_msi.py_	Wed Apr 30 09:53:56 2014
+++ c:/py/Lib/distutils/command/bdist_msi.py	Sun Apr 17 05:38:02 2016
@@ -302,8 +302,8 @@
                     afile = os.path.join(dir.absolute, file)
                     if os.path.isdir(afile):
                         short = "%s|%s" % (dir.make_short(file), file)
-                        default = file + version
-                        newdir = Directory(db, cab, dir, file, default, short)
+                        id = (file + version).lower()
+                        newdir = Directory(db, cab, dir, file, id, short)
                         todo.append(newdir)
                     else:
                         if not dir.component: