Can Old Tools read New Sessions?

Anyone know if it's possible for PT v5 to read a PT v6.4 Session File? I gave it a try by just changing the file extension from .PTS to .PT5, but it didn't seem to work. Just got a blank session with no audio files or tracks. Any tricks...

I've had no problems opening 6.4 sessions in 5.3.1. It converts the headroom setting back to +6, and off you go. I'd have to have my doubts about earlier versions of 5x/Win98. But who knows...?

No -- Pro Tools 5.0 cannot read a 5.1.1 and later session file.. save the session as a Pro Tools 5.0 session using Save Session Copy In... Rail

Who knows...? Rail knows.