Did you install with Win2000 or WinXP I noticed that these errors appeared when adding l_intl.nls to Wine as XP. On XP, when not adding this file, it's quite the same (I mean it's not crashing) and these fixmes are not there. In my honest opinion, that's not the cause of the problem. On both ways (with and without fixmes) the application is working the same. You should upgrade to the last Wine though, there had been some important work for the .NET since 0.9.58 and rc2 has not broken what was not broken before (I means assemblies are now installing but regasm is complaining quite heavily). For the stack overflow, try to install C++2005 before. I had it on my computer too with a fresh install and I have yet to understand why my unsupported way of installing is going around this.