Hi Filip, if you're looking for testcases, could you try the demo programs in http://bugs.winehq.org/show_bug.cgi?id=1268 and http://bugs.winehq.org/show_bug.cgi?id=1404 ? Especially the latter one, which has a tiny MFC demo program in both source code form and precompiled. It misbehaves badly with Wine, and has for years, but perhaps your patch will fix it. Thanks, Dan