In ‘Excel Options’ window, under Save workbooks section, click on the Save files in this file format: drop-down.

In Info screen that appears, click on Options.Note: For Excel 2007 and earlier versions, click on the Office button. In Excel 2010 and newer versions, click on the File menu.Note: Take a backup of the Excel file that you cannot open and try the steps on the backup copy. To fix the error, try changing the Excel default file format by following these steps: Trying to open the file with a different or incorrect extension may cause the ‘Excel cannot open the file because the extension is not valid’ error. Try any of these workarounds to fix the error and regain access to your Excel file data: Workaround 1 – Change the Default File Formatīy default, an Excel file is saved in. How to Fix ‘Excel Cannot Open the File Because the Extension Is Not Valid’ Error? Check out this video for a quick demonstration of how to fix “Excel Cannot Open the File Because the Extension Is Not Valid”

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