http://bugs.winehq.org/show_bug.cgi?id=22521
--- Comment #26 from Dan Kegel dank@kegel.com 2011-04-16 20:01:04 CDT --- OK, I've added this to winetricks in svn, though until we figure out the exit status 67, I won't use silent install.
Can someone who has an app that needs this try rm -rf ~/.wine wget http://winetricks.googlecode.com/svn/trunk/src/winetricks sh winetricks dotnet20sp2 and then see if that makes your app work?