Changing Files - MODs please read!

I've been wondering: can someone increase his rank/customize chars/etc by changing the place of the files? (C:\Program Files\G4 Box\CrossFire\rez..). Just like changing the kill marks and sounds.
I mean, is the account information saved somewhere in your pc, or is it saved in CF, in a replay for example? Like, when I first played CF there was already a replay saved on "Replays", but I cant watch it, so I wanna know if that's like a "checkpoint" or a code to know the items/weapons/chars you have.
Please answer!

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