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The Simplest Ways to Open, Edit, and Convert XLSX Files

You don't necessarily need Microsoft Excel to work with an .xlsx file Reviewed by Ryan Perian This article explains what XLSX ...
TWCN Tech News

Excel cannot open the file because the file format or extension is not valid

If you cannot open the Excel file from its location, simply open any Excel file and click the File tab. Then, go to Open > Browse and select the file giving error ...