http://bugs.winehq.org/show_bug.cgi?id=11203
--- Comment #30 from Stefan Dösinger stefandoesinger@gmx.at 2009-08-14 17:33:02 --- The thing is, you can't use 32 bpp pixmaps etc on X11. Its all 24 bit, there's also no alpha except in very few situations(that's partially why we need a DIB engine)
If there's any attempt to create a 32 bit X object we probably have to request a 24 bit one instead. Or that's how I understand it at least.