How to Open an XLS File in Excel. 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 ...

Locate the file in File Explorer. Click on the View tab at the top and check the File name extensions box. You should now see the .xlsx, .xls, or a similar extension at the end of your Excel file.

Every now and then, when I try opening an Excel file, I get a message saying that "Excel cannot open the file 'file.xlsx' because the file format or the ...

How to Open XLS Files in Mac OS X. 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 ...

After the MS16-088 patch is applied, though, Excel refuses to open XLS files, showing a blank screen instead of a workbook. Poster conker123 on the TechNet Office forum described the problem ...

If your Excel files are opening in Notepad on Windows PC, here's how you can reset the settings to make .xls, .xlsx, etc files open in Excel.

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 ...