Hi John
>Perhaps I can bring you a very nice NZ medicinal beverage when next in your direction, in exchange for the same for my private code built up over 30 years(!)

Depends on the structure. :)
For XLSX-Workbook there is at least a chain of commits of zips that I can unfold and reprocess.

Anyway, make a cut and start using gited repos for you VFP stuff. It is never to late. I've done this after 20 odd years in 2015, but there is no reason to wait.
Check FoxBin2Prg, learn git.

My POV https://github.com/fdbozzo/foxbin2prg/blob/master/docs/FoxBin2Prg_git.md

If I can help you - learning git, dealing with text files, or to squeeze your old stuff in a repo, let me know.