Windows 10: How do I REMOVE a deafault app for a file type

I want to completely REMOVE the app from the file. I accidentally clicked on paint not realizing "always open with" was on when I clicked it while trying to open up a .package file. I've tried looking for a solution to this problem which I did but after finding it and doing exactly what the person said, it proceeds to say "This app can't run on your PC. To find a version for your PC, check with the software publisher."I don't understand why it won't work and I'm extremely frustrated over it. Again I DO NOT want to change the default app to another app. I want to COMPLETELY REMOVE any app from

:)

 

How to change default app for file type

'Open With > Choose another app' has three step, in the first it only offers apps registered for that file type. If you click 'More apps' it lists all registered apps regardless of suitability. Both these steps have the tick-box for 'Always use...' in my 18363.752. The third step, if needed, is 'Look for another app on this PC'. The 'Always use...' must be ticked before taking this step if you want the change to stick. However, WMP appears at the second step.

For a quick look at a JPG almost anything (including WMP) is more practical than Photos which on my system takes more than ten seconds just to open a photo. The OP is probably not aware that the Windows Photo Viewer is still available in W10, but hidden away. That's my default viewer for JPG.


Restore Windows Photo Viewer in Windows 10

And, once enabled, is available in Settings > Apps > Default apps.

 

How to change default app for file type

@Bree - yes, I'm quite aware of this thanks, but as you will see it's missing. I recall reading that clicking the dialogue at a certain point in blank space made it appear, and trying that once successfully, but doesn't seem to help now. Plenty of other similar reports of this option being missing.





'Fix' described here: (essentially unassociate the extension)
Windows 10 "Always use this app" checkbox missing - Super User

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code: