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.

An Excel File is a file format created by Microsoft Excel. The extension of these type of files is “. xls ” (up to Microsoft Excel 2003) and “. xlsx ” (from Microsoft Excel 2007 onwards). It is used ...

Open Financial Exchange, for example, uses an OFX format that is not compatible with Microsoft Excel. Excel used the XLS format until Excel 2003, then moved to the XLSX format for Excel 2007 and 2010.

Is there a quicker way to learn the ins and outs of Excel’s formatting? Yes. Even though the tip above describes the old method of right-clicking a cell and choosing Format Cells, Excel 2007 includes ...