To fix the “Excel file format and extension don’t match” error, first check if the file extension matches its format. Try renaming the file with the correct extension (e.g., .xlsx for Excel ...

Launch Microsoft Excel and then press "Alt-F" to switch to the File tab. Select "Options" from the menu, and then select "Manual" from under Calculation Options on the Formulas tab.

Note: We have included screenshots of Excel. However, if you want to make the change in Word or PowerPoint, you must follow the same steps. The list of file extensions will be different as per the ...