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.

2. OpenOffice Calc: OpenOffice is a free, open-source office suite that includes a spreadsheet program called Calc. This program can open XLS and XLSX files and allows users to create and save ...

What Is an XLSX File? XLSX file extension belongs to Microsoft Excel sheets. Microsoft Excel is used to create data files wherein it stores data in text and numerical forms in cells. There are several ...