http://bugs.winehq.org/show_bug.cgi?id=19823
--- Comment #6 from Markus Elfring Markus.Elfring@web.de 2009-08-24 06:30:54 --- I do not know when the pixel formats "D3DFMT_R16G16", "D3DFMT_R16G16B16A16", "D3DFMT_R32" and "D3DFMT_R32G32B32A32" will be needed by the game. Their availability is checked several times.
D3DFORMAT: http://msdn.microsoft.com/en-us/library/bb172558%28VS.85%29.aspx
I imagine that the missing support might result in reduced frame rates.