http://bugs.winehq.org/show_bug.cgi?id=13387
--- Comment #12 from Hans Leidekker hans@meelstraat.net 2010-03-24 14:50:54 --- Created an attachment (id=27019) --> (http://bugs.winehq.org/attachment.cgi?id=27019) msi: Keep source directory and cabinet file separate.
Please try this patch.