I didn't make myself clear enough.
Normal user will never touch any file inside game folder except file to run current game.
But a bit more advanced one, who likes to know whats insider folders will start sniffing around. And it's only a matter of seconds.
It's not only about graphics but with everything: images, sounds, music, xml. Every file you are using in C2 is stored in that "package.nw" and can be easily copied, deleted or modified.
That's obvious if someone want to rip your assets he will do it, but why we should make it so easy?