Excel File Format or File Extension Is N…
https://www.hongkiat.com/blog/fixing-excel-file-format-error/
Ensure the file extension is correct. Press Windows + E to open File Explorer. Navigate to the “View” tab and ensure the “File name extensions” box is checked. Right-click the problematic Excel file and choose “Rename.” Try changing the file extension to the correct one, if applicable. Change the file format to a well-supported one. Open your Excel application and then tap the “File” tab. Hit the “Export” option from the list of menus and select the “Change File Type” option. Change files extension to some other file format that is well supported by Excel. After that click on the “Save As” option to check whether your Excel file is opening or not. Change the file extension. Right-click the file > Select Get Info > You can change the extension, such as xls.
Ensure the file extension is correct. Press Windows + E to open File Explorer. Navigate to the “View” tab and ensure the “File name extensions” box is checked. Right-click the problematic Excel file and choose “Rename.” Try changing the file extension to the correct one, if applicable.
Change the file format to a well-supported one. Open your Excel application and then tap the “File” tab. Hit the “Export” option from the list of menus and select the “Change File Type” option. Change files extension to some other file format that is well supported by Excel. After that click on the “Save As” option to check whether your Excel file is opening or not.
Change the file extension. Right-click the file > Select Get Info > You can change the extension, such as xls.
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