Make sure that in development _GENMENU variable points to correct menu generation program

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>I've ran in to this before, but I can't remember what I did to solve it! I've modified an existing menu, changing some commands to procedures. When running the .exe and I select an option from the menu, a file open dialog is displayed asking for the corresponding .mpx file.
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>Would anyone know why this is and what resolves the issue?
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>Cheers,
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>Andy