Windows 8 and 8.1 Forums


How to change default program to unknown application?

  1. #1


    Posts : 2
    windows 8

    How to change default program to unknown application?


    I have chosen notepad as default program for .dat file, what can I do to set it to open with "unknown application" like I never open it before?
    Step by Step guide is most appreciated =) im using windows 8

      My System SpecsSystem Spec

  2. #2


    Posts : 22,565
    64-bit Windows 10


    Hello Yuki, and welcome to Eight Forums.

    If you like, you could download and merge the .reg file for the listed .dat option in the table of the tutorial below to restore it's default associations.

    Default File Associations - Restore in Windows 8

    Hope this helps,
    Shawn
      My System SpecsSystem Spec

  3. #3


    Posts : 2
    windows 8


    Thank you Brink!
      My System SpecsSystem Spec

  4. #4


    Posts : 22,565
    64-bit Windows 10


    You're most welcome.
      My System SpecsSystem Spec

How to change default program to unknown application?
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