This workbook could not be opened because the file format

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How do you fix this workbook couldn't be opened because the file format may not be matching with the file extension?
How do you fix Excel Cannot open the file Xlsx because the file format or file extension is not valid on Mac?
How do I fix file format is not valid?
How do you fix the workbook Cannot be opened?

How do you fix this workbook couldn't be opened because the file format may not be matching with the file extension?

In Microsoft Excel, click File and then Options. Navigate to Save. At the "Save files in this format:" option, select "Excel Workbook (*xlsx)". This will resolve the issue for new spreadsheets saved via the add-in.

How do you fix Excel Cannot open the file Xlsx because the file format or file extension is not valid on Mac?

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.

How do I fix file format is not valid?

Try any of these workarounds to fix the error and regain access to your Excel file data:.

Workaround 1 – Change the Default File Format..

Workaround 2 – Edit the Excel File Permissions..

Workaround 3 – Recover Unsaved Workbook..

Workaround 4 – Repair the Workbook..

How do you fix the workbook Cannot be opened?

Repair a corrupted workbook manually In the Open dialog box, select the corrupted workbook that you want to open. Click the arrow next to the Open button, and then click Open and Repair. Do one of the following: To recover as much of the workbook data as possible, click Repair.