I think in the old days some of the 3rd party data software (OziExplorer, GPSUtillity, WP+) may have divided up the data into separate files, waypoint (.wpt), track and routes. If I'm correct I think a .wpt file will be a text file of waypoints. Fairly sure GPSBabel would do the conversion if you had a better idea what software was used originally.
Also if you can open the file in a text editor you may be able to copy the data without the header and paste into a text file created by other software. I believe that most GPS data files are just text files with unique headers and formatting depending on the software used to create them.
mcnut screwed with this post 12-21-2012 at 05:59 PM