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Today's Company of Heroes (CoH) patch 1.7 supports the (Vista only) DX10 API (Application Programming Interface/source code interface) link
"CoH 1.7 brings support for "per pixel" lighting for all objects inside the game, four simultaneous lights with shadows thanks to Render-to-Cubemap and Geometry Shaders. Additional effects include soft particles and particle effects blending, grass is now short volumetric (DX10-instanced terrain shells), normal map compression is now on, foliage and ambient objects are now DX10-instanced.
If you want to see DX10 in action with this first-gen title, head over to ATi, you need to use latest Catalyst drivers (7.5), while for Nvidia cards you should download 158.45, a beta driver located on Nzone ."
Direct X 9c download. (directx_apr2007_redist.exe 49MB)