To open these files, you will need community-developed tools. is the standard tool for handling .mpff archives from this engine generation.
“Pre GFX” refers to . In MW2, this is the set of commands the engine runs before drawing a single pixel. Tweaking this (via config files like config_mp.cfg ) can disable fancy lighting or shadows to boost FPS. Pro tip: Look for seta r_preloadShaders and seta r_picmip in your players folder.