Office Program Not Working in Windows 10 and Windows 11

The problem of “Office Program Not Working” may occur when you try to access an Excel workbook, a Word document, or a PowerPoint presentation using Excel, Word, or PowerPoint:

The file does not open in the desired office program.
An Excel workbook, for example, does not open in Excel 2019/2021, but rather in another office program or an earlier version of Excel.
You may see an error message suggesting a file association issue. You could get an error that says something like This file does not have software associated with it to execute this action.
Please install a office program, or establish an association in the default programs control panel if one is already installed.