If Excel files are not opening on double-click, first try opening the workbook in Safe Mode. If that fails, use the ‘Open and Repair’ feature found under ‘Open’ in the File menu.

If Excel is not set as the default application to open the Excel file types (.xls, .xlm, .cvs, etc.), the file may open in another application. Press Win+I key combinations to open Windows Settings.

Excel may not display the XLS file if another option is selected, giving you the impression that it can't open it.

How to Open Excel 2007 Files As Separate Windows. If you work with multiple Excel files over the course of a workday, and especially if you use a dual-monitor setup, you might wonder how you can ...

Here's how Open your file in Excel. From the Office tab, select Save As., In the new dialog box select your preferred file type, such as cvs or txt and click OK. You will receive a warning that (your ...