Regardless of whether or not you know how to help, you shouldn't. FPSB does not associate with pirated games. Therefore this thread needs to be locked.
Buy the game, and you wouldn't need help to begin with.
I downloaded the pirated one so I could play singleplayer until I got money to buy the "real" game which I have now. I wanted to transfer the data to it so I wouldn't have to redo everything. I guess I should of mentioned this before, but I didn't think it would be relevant.
Any multiplayer business is stored via Steam and IWNet. SO that means, achievements, unlocks, challenges, accolades, callsigns, all of that, is over the internet. However I have been able to find a file named "players" in the Modern Warfare 2 directory. That probably dictates what singleplayer missions are unlocked and the config setup so it's really not much.