Although you can run FoxPro for the Macintosh screens and Visual FoxPro 3.0 for the Macintosh forms from Visual FoxPro version 5.0 or later directly, you must recompile Visual FoxPro 3.0 program (.prg), form (.scx), query (.qpr), menu (.mpr), report (.frx), database (.dbc), and class library (.vcx) files to run them in Visual FoxPro version 5.0 or later.
To run Visual FoxPro 3.0 applications in Visual FoxPro version 5.0 or later
You must convert Visual FoxPro 3.0 projects to run them in Visual FoxPro version 5.0 or later. For details, see Converting Visual FoxPro 3.0 Files.