Yeah, my fault. I changed the labels for some reason and neglected to change this.
I'm not sure about the ARE sound resource without looking at the source (don't have time nor desire to). There's a custom class for those; I made a change early on to fix where it was looking, but I didn't look too much into the overall behavior (vs. just listing all known WAV resources) beyond seeing that it was made to keep out all but the "active" compressed BIFF. I don't think it ever worked right--likely Jon never got to finish it--so it's probably worth checking to see if it should be rewritten or just dropped altogether (we don't too much try to pretend to be more clever than the user in other areas that I'm aware of, so if you do something wrong, we should let you and the game will crash and you'll know better next time).