Foxlady - as Noel suggested, the only true way to save a frozen track is to right click and render a wave file of it.
Frozen tracks are just instructions - they don't create WAV files - unless you ask the program to do it.
Now were the tracks all midi, then that info would be good for transporting between similar computers and software in SGU and MGU, as long as the voices and patches were the same. RTs are a different matter.
At that point seems that DVDs and SEQ files and RB must enter the equation to do what you want to do.

Now mind you I have never applied or tried to apply any of this to a live gig - so I strictly speak from the desktop - but have shared files over the distance. Perhaps it's a thought for a future version, where those frozen track instructions are saved or can be saved for transport and regeneration.

Perhaps the PG can answer this and clear up any uncertainty.

My two cents - Ian

Ian
My "Original Tunes" Site
My gene pool needs more chlorine.