What tool can be used to extract the data? can it be edited like PC game by using notepad after extracted?
PS:is this the name of the file that need to modded? DLC5SURVSKILJACK.edat
If you have a jailbroken PS3 you can debug the memory in real time and edit the values.
https://rivalgamer.com/threads/how-to-mod-any-game-by-yourself.47/