Windows 10: The .xlsx file extension is not letting me set a default app for opening.

*** Moved from Excel by Mod ***I recently upgraded to Win 11 and I don't recall this being an issue for me in windows 10. My office version is Microsoft 365 Apps for enterprise.When I launch an excel file with the extension .xlsx, it by default launches in notepad. When I right-click "Open With", Excel is the first option, but selecting this does not change the fact that the next time I save and close the file it will leave notepad as the default. When I select "Open With" > "Choose another app" the options listed still include excel, but at the bottom of my screen where it would normally s

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How to set a default app for extensions?

Hi Tyler,

Which app are you trying to set for .res extension?

Please try to check the app you are trying to set. Is it feasible with .res extension?

I suggest performing the steps below and check if it fixes the problem.

Go to Setting - Apps - Click on Default apps - Click on Choose default apps by file type.

On the left, search for .res extension

Across .res extension, tap on Choose a default

Try browsing for the app.

 

xlsx files can't open

Hello Donald,

.XLSX is a file extension for an open XML spreadsheet used by Microsoft Excel. For us to better assist you, we'd like to know the following:

• Confirm which build is currently installed on your device. To check, follow the steps below:

• Press Windows key + R, then type in winver.
• Click OK.

• Is Microsoft Excel installed on your computer? If yes, which version of Microsoft Excel are you using?
• Are you getting any error messages when opening the .xlsx files?
• Did you create the said file or was it downloaded from a certain source?

We look forward to your response.

Regards.

 

Cant set the default app for extensions

Hi Alex,

Thank you for writing to Microsoft Community Forums.

We'd like to get more information regarding the issue.

1. May I know which app you are trying to set for
   .res extension?
   
2. Could you check the app you are trying to set, if it is feasible with
   .res extension?
   

You may follow the steps mentioned below and check if it helps.

1. Go to Setting >
   Apps.
   
2. Click on Default apps.
   
3. Click on Choose default apps by file type.
   
4. Look for .res extension on the left pane.
   
5. Across .res extension, click on
   Choose a default.
   
6. Try browsing for the app.
   

Hope it helps.

Manjunath H

Microsoft Community - Moderator