Iv been playin' around with mw2 files and there you go -
This will let you play private match only with people using this crack!
This is what you need to do :
1) Download the files attached below
2) Extract them to your MW2 folder
3) Rename iw4mp to "123"
4) Rename iw4sp to "iw4mp"
5) Go to steam and run MW2 Singelplayer
6) If done correctly,MW2 Multiplayer should be running without the "Cheat detected" error.
Thank me if I helped.