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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.
How To Open an XLR File. XLR files can be opened and edited with the now discontinued Microsoft Works. Some versions of Microsoft Excel can open XLR files but it may only be possible for XLR files that were created in Works version 8 and later. OpenOffice Calc supports the XLR format too.