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Now that the .PKG decryptor was released I decided to look into this.
The map pack for CoD looked very basic.
Files:
USRDIR
ICON0.png
PARAM.sfo
PS3LOGO.dat
In USRDIR:
mappack1
mappack1.edat
In mappack1:
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The maps are .ff's on pc too so i think this would be simple to do. I just need help with signing pkgs and stuff. Post your ideas

I think we can do this, but we would only be able to play with other jailbreak users that installed it too, and we'd probably have to use the map cmd to load the maps