If you cannot open the Excel file from its location ... and close it to apply changes. Why is my XLSX file not opening in Excel? If your XLSX file isn’t opening in Excel, you might not have ...

You don't necessarily need Microsoft Excel ... for why the file won't open at this point, if you've tried all the suggestions ...

XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.

Simply put, .xlsx is a file extension for the open XML spreadsheet used by Microsoft Excel from 2007 onwards. Why the change in format from earlier versions of Excel? According to many ...