2. Select Manage Workbook > Recover Unsaved Workbook . Excel file recovery options 3. From the list of files displayed, open the inaccessible file and save it. Solution 7: Open MS Excel in Safe Mode ...

To fix the Excel file format does not match extension error, trying opening the spreadsheet with the Open and Repair option or changing its file extension.

Locate the file in File Explorer. Click on the View tab at the top and check the File name extensions box. You should now see the .xlsx, .xls, or a similar extension at the end of your Excel file.

Every now and then, when I try opening an Excel file, I get a message saying that "Excel cannot open the file 'file.xlsx' because the file format or the file extension is not valid. Verify that the ...

How to Recover a Microsoft Excel File That Is Not in a Recognizable Format. If Microsoft Excel fails to recognize a file in the XLSX or XLS format, the data contained in the file could be corrupted.

Some users have been getting the "Data source reference is not valid" when trying to create a pivot table from a range in Excel. This particular error is ...

If Microsoft Excel does not recognize dates, then there is something wrong with the formatting. Use any of the methods mentioned here to format cells perfectly.