https://bugs.winehq.org/show_bug.cgi?id=31580
--- Comment #6 from Henri Verbeet hverbeet@gmail.com --- (In reply to Anastasius Focht from comment #5)
There is some other condition I couldn't identify yet, which finally results in code 0x88760B57 -> 'D3DXERR_SKINNINGNOTSUPPORTED' internally set and propagated through some code paths.
D3DCAPS8.MaxVertexBlendMatrices/MaxVertexBlendMatrixIndex perhaps?