Excel 2000, Win2k.

If I try to add an add-in via the add-in manager, I receive the
message: 'Not a valid add-in'. This message appears for just
this particular add-in, AFAIK.

If I browse to that add-in, double click it and then enable
macros, then it loads ok (together with its menu) and appears
to work ok.

What is happening, please?


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