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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. You can edit XLS spreadsheets you received from your customers or employees in Excel 2013 and save them as XLSX or XLS files.
In the case that your XLSX file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit XLSX file extensions. If your PC opens the XLSX file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating XLSX file extensions with the wrong software program.