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6 Fixes to 'Excel File Cannot Open because File Format or Extension is Not Valid' Error Repair Corrupted Excel File. Changing to Another File Extension. Recover Unsaved Workbooks. Restoring Previous Version of Excel File. Using Open and Repair Feature. Open Excel in Safe Mode.
Re: file extension is not valid , verify that the file is not corrupted Open MS Excel and go to ?File.? Now, select ?Export? and choose ?Change File Type.? Check whether it is showing the option of . xlsx or not. ... After enabling the ?File Name Extension,? you can change the extension of any file.
Save a workbook in another file format Open the workbook you want to save. Click File > Save As. Under Places, pick the place where you want to save the workbook. ... In the Save As dialog box, navigate to the location you want. In the Save as type list, click the file format you want.
How to Fix 'Excel Cannot Open the File Because the Extension Is Not Valid' Error? Workaround 1 ? Change the Default File Format. Workaround 2 ? Edit the Excel File Permissions. Workaround 3 ? Recover Unsaved Workbook. Workaround 4 ? Repair the Workbook.
You can restore the Excel file format, or the file extension is not valid from previous versions. Select the damaged file. Right-click it and click "Properties" > "Previous Version". A list of previous versions will appear; you need to select the option you are interested in and click "Restore" to recover.