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Texan's avatar
Texan
Copper Contributor
Jan 14, 2025

Annoying message when launching Excel...

Every time I launch Excel in Microsoft 365 I get the annoying message "Excel cannot open the file Book 9.xlxs because the file format or file format is not valid.  Verify that the file extension matc...
excel
HansVogelaar's avatar
HansVogelaar
MVP
Jan 15, 2025

If you are on Windows:

  • Quit Excel.
  • Start File Explorer.
  • Type or paste the following in the address bar, then press Enter:
  • %appdata%\Microsoft\Excel\XLSTART
  • If you see any file in the XLSTART folder except for one named PERSONAL.XLSB (or just PERSONAL), delete it or move it out of the XLSTART folder.
  • Start Excel again.
  • Does the problem still occur?
  • Texan's avatar
    Texan
    Copper Contributor
    Jan 15, 2025

    Thank you, Sir.  That folder is empty.

    • HansVogelaar's avatar
      HansVogelaar
      MVP
      Jan 15, 2025

      Let's see if anyone else has an idea...

      • Texan's avatar
        Texan
        Copper Contributor
        Jan 15, 2025

        Indeed, let us hope so.  This matter is shredding what little sanity I have left.

        Thank you again for your original reply.

         

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