Hello KnightFanDragon,
Thank you for your reply. I modified the files on my own mod, thou the mod was activated. I am trying to modify the M113. The ptr, when aiming my vehicle in the game shows a damage coeficient (the number that appears while aiming) of 10 (the number displays in yellow. For other vehicles like the german armored car with a mg-34 in a turret (sorry i dont remember the name of the vehicle), the armor is between 15-10, and the ptr does not always penetrate the armor of this vehicle. But the M113 (the vehicle I am modding

) has armor between 44-38, and should be invulnerable to a ptr shot with a damage coeficient of 10.
Following your comment, I did get the right file, but I did not changed hull or turret values, as these were not present in the original file of this vehicle, but I will try that next. Thank you for your help, and I will let you know if that worked. Take care, and regards.