I just re-installed COD4 today, and there was no way I was going to spend weeks unlocking everything again. Thankfully all the unlock data is stored client side, so here's the work-around for those of you in the same situation...
Just make sure that once you've put your own CD key back in that you join a multiplayer server before quitting COD4, otherwise it won't save properly and you'll need to repeat this process!
- Download and unzip the attached mpdata file.
- Go to Start -> Run-> Type regedit -> Hit Enter.
- Go to HKEY_LOCAL_MACHINE -> Software -> Activision -> Call of Duty 4
- Double-click codkey
- Save the key in notepad
- Replace the key with: DL2J8PY44Q22GE4888D2
- Press OK and close regedit.
- Navigate to your Call of Duty 4 profile folder (typically “C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles\your_user_name”)
- Back-up and then remove all the files in your user name folder.
- Place the mpdata file you downloaded in your user name folder
- Open the COD4 MP game and check your rank. You should now be level 55 with all challenges, guns, and every camouflage unlocked!
- Finally, in the game go to Options -> Multiplayer Options -> Key Code and type your original cd key you have saved in notepad.
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