>You mean to delete the old project and then make a new one... and then readd all of the contents?

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You only need to add your main prg (or scx if you have used a form as your initial entry point into your application). The "build" will automatically pull in all other items that are referenced in code - unless they are referenced through macro substitution or EVALUATE(), in these cases you should be using the EXTERNAL command. This tells the VFP compiler to include these 'other' files.