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.

If Excel is not opening on double-click or not responding on your Windows 11/10 PC, take a look at the addons first, or else follow these suggestions to resolve the issue.

Expand your file-protection options via Microsoft Office 2007's Trust Center The most recent version of the popular Office applications centralize security options and add a few new wrinkles.