http://bugs.winehq.org/show_bug.cgi?id=22595
--- Comment #3 from Andrew Nguyen arethusa26@gmail.com 2010-05-05 23:22:59 --- Created an attachment (id=27754) --> (http://bugs.winehq.org/attachment.cgi?id=27754) setupapi: Only check for a extraction cabinet filename match up to a termating dot or null character.
Try this patch. It needs more tests but it should please the installer.