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Saving project give strange "error message"

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When I save a project I get this error message:

You cannot save this document with extension ".3mf" at the end of the name. The required extension is ".curaproject.3mf"

and then I can choose between "use both" and use "curaproject.3mf"

Cura has automatically given the project a name that ends on ".curaproject.3mf" - so why does it complain and what does it mean?

The resulting filenames depending on what I choose are either:




Seems like Cura tries to be smart but is the opposite ;-)

Why don't Cura just not give it the right filetype?



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