I tried with DX9 mode but the game directory does not contain a D3D9.dll it only has a "gfx_d3d_mp_x86_s.dll", and installation of reshade me causes a conflict with it, which causes a startup crash. How can I fix this?

The Games tab says COD2 "works perfectly" with "d3d9.dll" but for me it has never worked.
Please help.

I dont know if this makes a difference, but i have the steam version of the game.