http://bugs.winehq.org/show_bug.cgi?id=33745
--- Comment #14 from Austin English austinenglish@gmail.com --- (In reply to comment #10)
With native dotnet20 (the game automatically installs it without possiblity to abort installation) the game somewhere crashes and outputs a "crash report" window where you can send a report to Microsoft (don't do it).
Does it help if you install dotnet20 with winetricks before installing the game?