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.

Once you do so, Excel files will become noticeable to the operating system again and you should make the file-to-program association once again to confirm the setting.

These step-by-step instructions show you how to add the Developer tab to the Ribbon in Word and Excel 2016 and Office 365, and to use it to launch the Visual Basic Editor and access Visual Basic ...