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 ...

Businesses that switch to Mac computers may encounter problems when attempting to open some file types, such as Excel Spreadsheet (XLS) files. Macs do not have a native program for opening XLS files, ...

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 ...

The Excel File Converter repository contains a Python script that allows users to convert old Excel file formats (.xls) into newer ones (.xlsx), while preserving the data and structure of the original ...

The xls file should open as a Spreadsheet. This doesn't happen with all XLS files, just some. Unfortunately, I cannot share the example file this happens with. Excel warns me that the file format and ...

I'm hearing rumblings about some of our APAC users taking minutes at a time to load excel files over the network from the local file server. This seemed to start about 3 weeks ago, the troubleshooting ...