All Chests Unlocked

Should make every chest unlocked and not require cunning or a rogue to open. But you wont get any experience for them.

Place it in Documents/BioWare/Dragon Age 2/packages/core/override

as suggested by Scorpion1082 ... for those worrying about the exp loss, just add exp via console or change the exp reward with one of the do it urself options found on this website.