The following steps will help you check updates for Microsoft Office: Open any Microsoft Office application, Word, PowerPoint, Excel, etc. Go to “ File > Account.” ...

File-security limits can curtail your ability to open or save Microsoft Excel files.

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.

Check "Always Use the Selected Program to Open This Kind of File" check box and click OK. If the steps above don't associate the correct version of Excel with your files, use the command line to ...