I was talking about DirectX not OpenGL , of course the main engine was
done and optimized for the best graphics ( water etc.. ) with OpenGL but
when run under DirectX it was and it is 8.0 version , sorry .
EDIT: It's DirectX 8.1 to be precise updated for Windows 98, Windows Me
and Windows 2000 which was latter on just backward compatible with DirectX 9.0
Game is using d3d8.dll when DX is selected .