Windows 11 Version 22H2 (OS Build 22621.3880)
MS Office 2013 Pro Plus
Why does the warning "Microsoft Excel isn't currently your default program for viewing and editing spreadsheets. Do you want to select file types that Excel should open? Don't show this message again"

constantly appear when I start Excel, despite the fact that Excel is set as the default application for all possible file extensions associated with Excel in Settings - Apps - Default Apps?
Of course, I can select "Don't show this message again" or uncheck "Tell me if Microsoft Excel isn't the default progam for viewing and editing spreadsheets." in Excel - File - Options - General - Start up options, but this is not a solution.
I don't understand why this warning "Microsoft Excel isn't currently your default program for viewing and editing spreadsheets. Do you want to select file types that Excel should open? Don't show this message again" appears, although Excel is actually the default application. This pisses me off like crazy.