What should I do if the Excel table cannot be opened and the file extension is invalid?

When you encounter an "Invalid file extension" error when opening an Excel file, the reason is that the file format cannot be recognized. Workarounds include: Check the file format to make sure it is ".xlsx", ".xlsm", or ".xlsb". Try opening the file using another program like Google Sheets or OpenOffice Calc. Rename the file to the correct extension (e.g. ".xlsx"). Use repair tools in Excel to repair damaged files. Check the file permissions to make sure you have open permission. Update Microsoft Office software. Reinstall Excel.

Invalid Excel file extension: How to fix

When you try to open an Excel file, you encounter "File "Invalid extension" error means that the file format cannot be recognized.

How to solve

1. Check the file format: Make sure the file is a real Excel file. The correct file extension should be ".xlsx", ".xlsm" or ".xlsb".
2. Try a different program: Try using another program, such as Google Sheets or OpenOffice Calc, to open the file. This can help troubleshoot problems with the Excel application itself.
3. Rename the file: If the file extension was modified incorrectly, try renaming it to the correct extension (e.g. ".xlsx").
4. Use the repair tool: Excel has a built-in repair tool that can try to repair damaged files. Open the File menu in Excel and select Open and Repair.
5. Check file permissions: Make sure you have permission to open the file. The file may be password protected or you may not have sufficient access rights.
6. Update Microsoft Office: Make sure your Microsoft Office software is up to date. Older versions may not recognize some file formats.
7. Reinstall Excel: If the above method does not work, please try to reinstall Excel. This will replace potentially corrupted program files.

Additional Notes:

• The file may actually be corrupted beyond repair.
• If the file was downloaded from an email or website, make sure it comes from a trusted source.
• Back up your Excel files regularly to prevent them from being lost or damaged.

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