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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.
I am trying to open excel files (*.xls & *.xlsx) that were created with MS Office 2010 OR LibreOffice OR OpenOffice. When I double click one to open it, Excel (2013) opens but the file does not & there is no error message displayed. I can only open the file in Excel by using File > Open > & browse for the file. When I open *.xls files, it shows  [Compatibility Mode] - Excel after the filename in the title bar. Everything else works fine such as editing, printing & saving, just not double clicking to open.