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.

In the free open-source office suite Apache OpenOffice, Calc is the spreadsheet equivalent to Microsoft Excel. Calc allows you to open and edit files originally saved in other programs and formats, ...

Spreadsheets: love them or hate them, they are a part of modern-day life and Microsoft’s Excel software is the go-to for most users spreadsheet needs. But what happens when you want to edit a ...

This month's monster security patch for Office breaks Excel when it tries to open HTML files, and it seems unlikely Microsoft will fix the problem Excel users are reporting an odd bug in the way Excel ...

PASADENA, USA: Open Files Inc.announces the release of XLSX Open File Tool, an advanced data recovery tool with a simple interface that is perfectly suitable for users of all skill levels. The UI of ...