http://bugs.winehq.org/show_bug.cgi?id=24013 has some good points: it's not a direct duplicate of any other bug, it mentions which game is affected, it is linked to that game's appdb entry, and it seems to be assigned to the right component. So I'm glad to see you do testing like this, even if it might be a while before Wine gets around to implementing these functions. It could be better: you could give the exact command used you could give the winetricks command to work around the problem you could give the sha1sum of the dvd (more useful with downloads) But I'm not quite sure it's valid as written, since if you run AssassinsCreed_Dx9.exe, that game *doesn't* really require dx10. (Right?)