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Excel error message: the file format or file extension is not valid. Verify that the file has not been corrupted and that the file matches the format of the file
iMac 21.5", macOS 10.14
Hello, while opening excel file I am getting this Alert and cannot open the files:
Excel cannot open the file 'adj as sk email .xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file.
Is it an Excel file or was the extension .xls just added to the filename.
the file format or file extension is not valid.
