http://bugs.winehq.org/show_bug.cgi?id=28241
--- Comment #3 from Juan Antonio Romero nsdragon@gmail.com 2011-09-01 16:51:36 CDT --- (In reply to comment #2)
Try installing winetricks vcrun2008.
I did, actually. Tried both via winetricks and when prompted by the Rift installer itself, but it didn't make any difference either way.