If it was created on a older session (6.4) and MAC compatibility was not selected I think that you are in a bind. The only thing to do if you can read the audio is import it into the session and try to line it all up. Or, Possibly try to make a new session, then go into the old data and do a "IMPORT SESSION DATA" in Pro Tools and see if it will open and allow you to select all the tracks. If it does, and I forget as it has been YEARS since I was on 6.4, it should import in those data tracks with the audio pointed correctly. Try that and see what it does. If it reads the audio that is a good thing. MacDrive is a piece of software that is worth getting too in case it is a MAC formatted drive. 50 bucks for that app. Let us know what happens with the above issue. Doc