http://bugs.winehq.org/show_bug.cgi?id=28602
--- Comment #6 from Vincent Povirk madewokherd@gmail.com 2011-10-06 21:58:18 CDT --- Actually, CorBindToRuntimeEx was the only thing modified by that commit, and it would show up in the mscoree log if it were being called. Since it isn't being called, I can only conclude that your bisect is wrong.
Though it happens that it is using fusion.dll in a way we can't currently support. (We'd need to create multiple instances, one for each requested .NET version, and that's currently impossible with a buildin dll.)