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just thought i would post this (note i didnt make this or have anything to do with it) credit goes to GameTuts
Tutorial: First download our New Program Modio- You must login or register to view this content.
After that open up Xplorer360 (while you have your HDD connected through your a transfer cable) and look for for your Call of Duty : WaW Game save. Extract it and open it up in the CO Waw Mod Tool via Modio. Enable the Mods of your choice and Click "Mod File" . That will mod it and Resign/Rehash it. Now just insert it back in the original place in Xplorer360 and Your Done!
Look in the download for further information on the Tutorial.