make sure u extract the file inside the save and then use the decompress tool. Im going guess that you just decompress the save .
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Another thing I noticed when I do this is my save is doubled in size no matter what value I put in. Is that supposed to happen?
I finally gave up on this but there is a editor that worked for me on the main page!
I got iH8 Fr0st's editor to work by using a Created player and not an actual player, maybe thats why hex editor wouldnt work
Downloads - peek-poker - Memory peeking and poking - Google Project Hosting
Has the madden 13 plugin