>>There is a difference in the extensions you use. As you may be finding at the moment, it is not too difficult to find which are menus, screens, etc by the extension. Just imagine if, when you inherited this app, ALL the files were called .PRG - which one is which??? At least if you use the default extensions provided by FoxPro, you know that MPR is a menu program, SPR is a screen program, etc.
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>You mean you can put any extension you want on anything? I thought the defaults were what you _had_ to use. So doing menu.prg is just cosmetically different from menu.mpr? There's no difference in functionality?
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>Thanks,

That's right. The 'PR' bit on the extension tells you that it is program source code as opposed to internal menu/screen code. To avoid confusion though, I would assume most people stick with the defaults.