Noel posted long ago about the file structure of a bun and that they could be opened in a wav editor IIRC. All the clips are daisy chained within the file, but not sorted like a project would see. I am on my cell so can't find that post and forget if a wav editor needs to see it with a .wav extension to open. Never tried that out, but worth mentioning. You would only recover the underlying clips (and need to split them, etc.) if it worked.