http://bugs.winehq.org/show_bug.cgi?id=34408
--- Comment #8 from Austin English austinenglish@gmail.com 2013-09-03 23:46:37 CDT --- (In reply to comment #7)
Created attachment 45853 [details] Dotnet20 Installed
I've installed dotnet20 using winetricks and launches the same error : "Please use the launcher"
And this time the runtime error didnt appeared....so no wine debbuger :/
Try running it from Steam instead (or use steam -applaunch).