I'm not exactly an expert on ripping but I think trying to open the files and check what they are would be a good move (if you haven't done that already and its possible)
Handing the file off to someone else could also be a good move, sorry I can't help as much as I would like to but I don't...
sorry, beein trying to find this file that's been right in front of me for a month now, only to find broken links, and google to prove that it's completely worthless.