I'm suprised at the variety of different files that have been uploaded. I can write interpreters for them, but it will take a few days. I'll post updates here as I work on it and email people directly.
The G7ToWin format seems okay and won't take too long, but those that came from Pilot IIIs don't have altitude info. Am I right in thinking the Pilot III doesn't store it or were there just not enough satellites in view?
The current interpreter is based on logs recorded on a GPSMAP96 and exported as plain text files.