http://bugs.winehq.org/show_bug.cgi?id=24928
--- Comment #14 from Danellos trevor.w.philip@gmail.com 2010-11-07 01:23:11 CST --- Hi there
thank you very much for finding this out! I will definitely make a point today to add that to the HOW-TO.
I would just like to stress once again to a previous poster, that the -d3d10 is an invalid extension in WoW and, like was said already, you will be reverted back to dx9.
I would also like to again stress that although the settings may be "maxed out" in dx9 mode, it will NOT look "maxed out" due to the nature of the shader model support of the d3d9 api, even in WINE.