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.

A missing Excel file isn’t always the disaster it feels like.

Some MS Excel users reported Excel is not opening on double-click on their Windows computers, and some other users reported that Excel would open normally but the Excel file would not open. These ...