VBA stop macro if the file we refer to is not opened

Try:

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PS. Pana Łukasza oczywiście zapraszamy na polską wersję forum czyli z .pl na końcu. Ekipa z Wrocka jest dość licznie reprezentowana :-)

Of course you don't have to remember "magic 64" - there is a constant vbInformation
Or I suppose, such situation shall trigger higher level of alert so vbCritical (16) will be more appropriate.

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And more basic question - May be instead of stopping macro it would be more appropriate to automaticaly open it (especially easy if we know the path).

Using my example (but could be also applied to one presented by nilem:

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