Windows 8 and 8.1 Forums


How do i change default application to Unknown Application

  1. #1


    Posts : 6
    windows 8

    How do i change default application to Unknown Application


    I have accidently set my .ext default program to Notepad and I want to change it back to an unknown application I have tried deleting it in regedit and it just sets it back to notepad even when I restart my computer afterwards any help would be much appreciated

      My System SpecsSystem Spec

  2. #2


    Posts : 22,576
    64-bit Windows 10


    Hello Jerry, and welcome to Eight Forums.

    I've added .ext to the list in the tutorial below to restore it's default association.

    Default File Associations - Restore in Windows 8

    Hope this helps,
    Shawn
      My System SpecsSystem Spec

  3. #3


    Posts : 6
    windows 8


    Quote Originally Posted by Brink View Post
    Hello Jerry, and welcome to Eight Forums.

    I've added .ext to the list in the tutorial below to restore it's default association.

    Default File Associations - Restore in Windows 8

    Hope this helps,
    Shawn
    it is still opening it as a notepad this is really frustrating please help
      My System SpecsSystem Spec

  4. #4


    Posts : 22,576
    64-bit Windows 10


    Did you restart the computer after merging the .reg file?
      My System SpecsSystem Spec

  5. #5


    Posts : 6
    windows 8


    Quote Originally Posted by Brink View Post
    Did you restart the computer after merging the .reg file?
    yes i did
      My System SpecsSystem Spec

  6. #6


    Posts : 22,576
    64-bit Windows 10


    In that case, see if the method in the tutorial below will be able to unassociated for you.

    File Extension Type - Unassociate - Windows 7 Help Forums
      My System SpecsSystem Spec

  7. #7


    Posts : 6
    windows 8


    Quote Originally Posted by Brink View Post
    In that case, see if the method in the tutorial below will be able to unassociated for you.

    File Extension Type - Unassociate - Windows 7 Help Forums
    this method did not work either it keeps reseting it to notepad
      My System SpecsSystem Spec

  8. #8


    Posts : 22,576
    64-bit Windows 10


    In that case, you could also do a system restore using a restore point dated before you changed the association to undo it.
      My System SpecsSystem Spec

  9. #9


    Posts : 6
    windows 8


    Quote Originally Posted by Brink View Post
    In that case, you could also do a system restore using a restore point dated before you changed the association to undo it.
    well I have installed programs i need for work(games) so wouldnt be a good idea for my line of work
      My System SpecsSystem Spec

  10. #10


    Trnava
    Posts : 683
    Win 8.1.1 Pro x64


    Try this.
    How do i change default application to Unknown Application Attached Files
      My System SpecsSystem Spec

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How do i change default application to Unknown Application
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