I haven't tried re-naming it... I'm working in 10.e 64-bit.
If I wasn't trying to get around the famous swapped media bug, I wouldn't have to do this. I now have another project that when I go back to render to another format, Vegas swapped out a section of the interview audio with sound from another clip. My original AC3 Audio renders are fine if I could just lay them in the timeline and work from there.