Do not edit the original .img files directly if you use Kitserver. Instead, place your modded files in the appropriate Kitserver\img subfolder. This preserves the original game and makes patching reversible.
For example:
I can provide more specific for a certain team or player if you tell me: Which specific team or league are you trying to edit? Pes 2013 Img File List
For modders and patch makers, understanding this file list is the foundation of customization. Do not edit the original