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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 a PLS File. The easiest way to open a PLS file is to double-click on it and let your PC decide which default application should open the file. If no program opens the PLS file then you probably don't have an application installed that can view and/or edit PLS files.erhaps you tried to open the PLS file but Windows told you that it could not open it. Before you can open a PLS file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the .PLS file extension refers to.