http://bugs.winehq.org/show_bug.cgi?id=27288
--- Comment #4 from Alex Bradbury asb@asbradbury.org 2011-05-27 09:25:54 CDT --- (In reply to comment #3)
Created an attachment (id=34912)
--> (http://bugs.winehq.org/attachment.cgi?id=34912) [details]
msi: Pass custom action arguments separately to CreateProcess.
Try this patch.
I'm afraid installation still ends prematurely. I'll attach a new +msi log. You can reproduce just by attempting to install this app to a fresh WINEPREFIX.