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.

If you're still saving Excel spreadsheets with a three-letter .xls extension, you're lugging around a digital anchor from the era of dial-up. Beyond being a 1990s relic, these legacy files are slow, ...

XLS files are spreadsheet files created by Microsoft Office Excel. An Excel spreadsheet can contain anything from images and plain text to graphs and tables and can be opened using Excel. If a ...

how the SAS/ACCESS interface works. XLS files contain data in the form of Microsoft Excel spreadsheets. Unless otherwise noted, Excel 4 and Excel 5 files are referred to collectively throughout this ...

Transform legacy spreadsheets into maintainable, automated tools that scale and survive the test of time.

If you notice that your Excel files are opening in Notepad, then read this post to learn how to fix the issue. The default behavior of a document or file is to open in the application with which it ...