>dBASE III was pretty similar to Foxbase. Code was in PRG files (there was no project manager). dBASE III also had no compiler, so if there's an EXE, it was built with some other product.

Yes, most propably with FoxBase; it was 100 % compatible.

Note that if you have FoxBase (or FPDos) you must be able to run the app just from the PRG's. Smack everything into one directory (PRGs DBFs etc.) and hope for no hard coded paths. Find the main program, and perform a DO of that. Hope that no Procedures are involved.