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OK its Dm430 here and i had something hit me ... A posible way of editing the mw2 patch_mp.ff. while looking at an old decrypted bin file i said to my self why are we trying to extract the the file every thing is right here? In theory you would just modify the actualy content you are viewing then fix the checksum and heads... you would have a modified file. Also have you tried any data recovery software to extract the file rather then decompressing it?
Also if you want to extract it copy from the header to the footer of the patch.
Well i hope this help i have not tried it but wanted to see what you think.