I'm glad (and slightly surprised) that it worked. It was put together in 10 minutes and not really tested.
The reason the 'MUSIC' bit on filenames didnt appear, was because it was looking for creative VOC blocks, rather than imuse which the full game uses (as Murray said). There arent any filenames unfortunately, just the ID numbers, so theres no way of knowing what the real names would be without guessing. I might update and release the program at some point and add in support for ripping the audio etc.
I dont have SWOL installed anymore so I cant look at the sound files, but I'm pretty sure that the file formats wont be readable by SCUMM Rev. It was developed by an outside developer, not LEC themselves, so it'll use whatever format they normally use.