Hi all, I have been trying to get sweetfx working for this old game with no luck. I know it's open GL do I have to use another program to work along wiht sweetfx to get it to work? Thanks

Yes, you need to use the ReShade version of it, which is SweetFX 2.0, to use SweetFX with OpenGL games. You can find the Download in the downloads section. However there is no guarantee it will actually work.