The file is saved local on the computer, and it has not been saved as a .ggb
When you say that 'the file is saved on the computer, but not a .ggb, as what kind of file is it saved?
The file is saved as a .file
You are working with an app or on pc with which version?
If you're working with the download-option in GG6 choose the option .ggb and keep this option. By itself GeoGebra will not invent the extention .file
We use the client version "GeoGebra Classic"
Which exact version?
Please try the newer version from https://www.geogebra.org/download
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