http://bugs.winehq.org/show_bug.cgi?id=32092
--- Comment #18 from Cogohi winehq@projectplasma.com 2012-12-03 10:03:56 CST --- Did a bit of googling this morning and found the following:
http://stackoverflow.com/questions/1204452/passing-d3dfmt-unknown-into-idire...
See the answer by GManNickG. Basically treat it like D3DFMT_A8R8G8B8?