i'm sure that all spanish league teams have pre-loaded faces, they're one of the leagues that dont need a facepack. if you only want to change messi's face though, create the image you want to use, and put it in the same folder as the other faces you have, and you should be good
i don't have a clue. but you don't really need to access the pre-loaded images to change them. just do what i mentioned before, and it should change without changing the presets.
I understand what you say but i cant change messi face because I cant find the folder that messi picture is in lol