Open an Excel file

[Friend]

I don't know what oind of crap book you read or how you misunderstood the advise.

The crap book is: Automate the boring stuff with Python from Al Sweigart and maybe i misunderstood the advise, thanks anyway

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Libre Office has its own format (.ods) for spreadsheets. You can't just change the extension.

From Libre Office choose Save As and in the Save as Type drop down pick the most recent Microsoft Excel in there (my copy it is 97/2000/XP).

ahhh now it worked, many many thanks :)