Windows 10: Undo "Open With"

I accidentally right clicked on an update file has extension .update in my Downloads Folder and selected "Open With" Wordpad. I want to undo this. I have tried:Resetting all default appsSaw a post that suggested creating a file in wordpad, right clicking on the update file and click on the wordpad file to open it with that file, then deleting the wordpad file to break the open with, but when I right click on the update file and tell it to open with the wordpad file i just created, I get an error message saying "This app can't run on your PC. To find a version for your PC, check with the so

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How to undo "always open with" option in Windows 10 (1803 build)

I accidentally click "always open with" a particular application on a BibTeX file and now the icons of all such files change to the icon of that app and I cannot find a way to undo the operation. In fact, I want Windows to always ask me how to open
a BibTeX file instead of sticking to a specific program. Thanks for any suggestions!

Here I found some related posts but none of them seem to solve my problem:

• How do I undo "Always open with" option in Windows 10
• How to undo "Always open with" option in Windows 10

Here are what I've tried, but none of them works:

• Execute "assoc .bib= && assoc .bibtex=" in cmd.exe as Administrator.
  Nothing happens.
• In Settings under "choose default apps by file type", remove the default app at ".bib" entry.
  However, there's no such entry.

 

Mail app will not open on 10041.

Hello Adam,

This is the suggested solution below if you haven't already tried it.

In this Windows 10 build 10041, the Mail, Calendar, and People apps may be broken due to a licensing issue with the Store Beta. To get these apps working again, you need to follow these steps:

• Open powershell as administrator
• Run the command Get-appxprovisionedpackage –online | where-object {$_.packagename –like “*windowscommunicationsapps*”} | remove-appxprovisionedpackage –online
• Re-install Mail, People and Calendar from the Store (green tile)

 

Undo option in File Explorer

Hi Helena,

We appreciate your time and effort for getting back to us.

Try the following steps and check if it helps:

• 
  Press Windows + E keys from the Keyboard to open the
  File Explorer.
  
• 
  Click on the drop down of Customize Quick Access Toolbar beside
  File Explorer.
  
• 
  Click on Undo.
  

Kindly let us know if you need any further assistance with Windows. We are glad to assist you.

Thank you.