HI TO EVERYBODY

I TRIED TO ADD A NEW SKELETON TO MY GAME.
I USED THE XTRACTOR PACK OF VERCINGETORIX TO UNPACK THE SKELETONS, THEN ADDED THE NEW ONE (THE FILE OF THE NEW SKELETON), THEN I REPACKED THE FILES. FINALLY I CHANGED THE descr_model_battle.txt FILE WITH THE NEW SKELETON ADDED. AND WELL.... THE GAME DOESNT WORK. WHAT I HAVE TO DO? IS IT NECESSARY TOUCH ANY OTHER FILE? IS IT NECESSARY ADD NEW ANIMATIONS TOO? PLEASE HELP ME WITH THIS.

THANKS.