If I recall the old days, FoxPro is rendering it's own "fonts" (it's not using system fonts).
Depending on what version of FoxPro are you talking about, it might be possible to find them in some of the FoxPro installation directories, but I doubt that you could use them directly as a system font since I'm almost sure they're not true type fonts.
If you need these fonts badly however, than you could re-create them as TrueTypeFonts with a little work:
- form FoxPro do some reports to print all letters and symbols at bigger sizes (but various too - to see the scale ranges)
- print all of them on the paper and scan them back (or use a print driver to capture the images)
- Use an advanced Font Editor to create them, and put those scanned font images as an background underlay to easily and quickly made them based on the contour of the FoxPro fonts.
This is basically how most Font creators do their font too: they draw by hand the some sketches, than use them as background/under-layer in a Font Editor.