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 Microsoft Excel fails to recognize a file in the XLSX or XLS format, the data contained in the file could be corrupted. When you open a corrupted workbook in Excel, the program should automatically ...

When an Excel file goes haywire, don't give up hope. Using one of these recovery tricks, you may still be able to salvage the data. When an Excel file goes haywire, don’t give up hope. Using one of ...

All these fixes are explained below in detail. 1] Are you saving the file as CSV? CSV is the Comma-Separated Values format for Excel files. Excel does not save formatting in CSV. Therefore, if you are ...