Yes, I believe that is normal. The ResFiles (Resource Files) directory is CFPs UI (skin, icons, images, etc…), which I believe it unpacks dynamically when you run it.
You can probably stop that behavior, if you wanted, by making a clone of CFPs skin & calling it something else… can’t remember the exact details (there’s a post on it somewhere), but it’s something like a sub-directory name, that CFP can reference from the Settings screen. It’s intentionally like that to allow users to make their own skins & for the sponsored (not sure if it’s called that?) version.