Do we get the source files?

Overall, this is a huge chunk of code that can be disassembled and reassembled however you like, but before you start doing something like that, you need to figure out where everything is located. As far as I understand, all the mechanics are in the files, the executable is the key, the start button that begins to turn these gears. I want to study the files that contain the faction IDs, but I don't know where they are. Can anyone help me?