http://bugs.winehq.org/show_bug.cgi?id=34276
--- Comment #4 from Nikolay Sivov bunglehead@gmail.com 2013-08-16 08:46:39 CDT --- I sent a patch http://www.winehq.org/pipermail/wine-patches/2013-August/125865.html.
The problem only happens when file name in manifest differs in case from a key, resulting in lookup failure.