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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.
1 Start the Microsoft Windows Explorer. 2  On the Tools menu, click Folder Options. 3  Click the File Types tab. 4  Click the file type that you want (that is, Microsoft Excel Worksheet) in the Registered file types list. 5  Click Advanced. 6  Under Actions, click Open, and then click Edit.hen you double-click a Microsoft Excel file type (.xls), Excel starts as expected, but then you may receive an error message that is similar to the following: When you click OK on the error message, the message reappears. After you repeatedly click OK, the file opens. C:\. .xls' could not be found.