https://bugs.winehq.org/show_bug.cgi?id=29521
--- Comment #29 from padraig padraig_mac@hotmail.com --- I had to create a wine prefix for it too, it didn't work in system wine. Also you could try using the patched d3drm.dll from here: http://en.dark-omen.org/downloads/5.-miscellaneous/index.html I did use it but it didn't seem to make a difference.
The other dll I mentioned (and d3drm.dll) are here: http://www.mediafire.com/file/fnnkq89xdjy75m0/DarkOmenMods.zip/file
I've put full instructions for what I did here: http://forum.dark-omen.org/help-section/dark-omen-linux-textures-flipped-t15...
Let me know if it doesn't work and I'll try on another machine.