Halo map tools help!?

OKAY well i was messing around with halo map tools and idk why! but i accidentally got a pistol projectile code and went to weapons and replaced the pistol code for the projectile code and when i saved it , i relized what i did wrong....... now i cant get bloodgultch to work at all!!! even with the backup files i have!!! i replaced the bitmap files and everything but the map is still messed up somone help me out here