i got missions open from the 000136dc.dat file using the offset that DT provided 10E6 - 3F30. it didnt give me errors when i opened it or anything it open fine for me.
Is the "security" acchieved just by changing the offsets? Because I've been told that the eboot and default_mp.self have added checks now, I'm more involved in PS3 hacking than MW2, so I'm not so up to date