http://bugs.winehq.org/show_bug.cgi?id=25166
--- Comment #11 from Damjan Jovanovic damjan.jov@gmail.com 2010-11-18 03:58:01 CST --- My icons patch has been accepted and I've written and submitted a patch to deduplicate associations in some cases (http://source.winehq.org/patches/data/68621). To try the latter you'll have to delete Wine's cached associations by running:
wine reg delete HKCU\Software\Wine\FileOpenAssociations