HaloMods "Classic" Read-only Archive

i don't know but I have tried every thing I am guessing there is some sort of anti-hack thing installed that is not letting me go and mod halo

I am a complete noob at modding. Ok so I have all the tools I need and the mods I want. (the mods are .ppf). When I go to HHHT of PPF-o-Matic and apply the mods it works but when I go and try to play the game the mods are not applied. Is there some sort of fail safe or fire wall that halo has that i...