I wanted to tinker around with the Fire Emblem Awakening DLC files, so I grabbed the CIA files online. However I'm unsure if I can even do anything with these files. The furthest I've gotten (if you can call it that) is trying to use ctrtool to extract the contents, but I get an error "Common key could not be found" (or something similar). Are these files encrypted? Or is there some easy way I could break them apart again?