http://bugs.winehq.org/show_bug.cgi?id=17976
--- Comment #2 from Hans Leidekker hans@meelstraat.net 2009-05-16 10:16:24 --- Created an attachment (id=21125) --> (http://bugs.winehq.org/attachment.cgi?id=21125) msi: Assembly file version field is optional.
So apparently the assembly file version field is optional. Try this patch.