repacking mrs files

ive been able to unpack the mrs files and edit some of the files inside
i.e
custom loading screens,
switching around weapon properties,
changing weapons etc


the proplem is when i repack the files and try to play after about 10 mins i get
the game has terminated with an unknown error

anyone have experiance with this

mabey @Shunnai can help??

The edit files are corrupting your gameplay.

anyway around this?any of the combat arms tricks for injecting modified files work with guns as well
?