Does any game use opengl? I have put opengl shaders on and tried battlefield 1942, Raven shield, Splinter cell, and ut 2003 but none of them are affected. I have only tryed the direct3d shaders with ut2003 but it works.
None of these are OpenGL games. You would need to use a Quake-engine based game, like any of the Quake games, Call of Duty, Return to Castle Wolfenstein, etc. You could also use Warcraft 3 if you use the /opengl option in the shortcut for the game to make it run in OpenGL mode.