Windows 8 and 8.1 Forums


Open with "Choose default program" Error - Fix

  1. #10


    Posts : 2
    Windows 7


    Hi all,

    I have the exact same problem/error message but I'm running Windows 7. After researching the issue, it seems to be related with the mentioned registry key: HKEY_CLASSES_ROOT\Unknown. This key seems to be incomplete in my registry with only one sub-folder, this being 'DefaultIcon'. I can only assume this occurred after I used the registry cleaner tool incorporated into AVG. Is there a replacement key that I can download which will resolve this issue?

    Many thanks,
    Koray

      My System SpecsSystem Spec

  2. #11


    Posts : 22,576
    64-bit Windows 10


    Quote Originally Posted by korayhamza View Post
    Hi all,

    I have the exact same problem/error message but I'm running Windows 7. After researching the issue, it seems to be related with the mentioned registry key: HKEY_CLASSES_ROOT\Unknown. This key seems to be incomplete in my registry with only one sub-folder, this being 'DefaultIcon'. I can only assume this occurred after I used the registry cleaner tool incorporated into AVG. Is there a replacement key that I can download which will resolve this issue?

    Many thanks,
    Koray
    Hello Koray, and welcome to Eight Forums.

    If you like, you could download and merge the .reg file for the Unknown option in the tutorial below instead to restore it's default associations and registry values in Window 7.

    Default File Type Associations - Restore - Windows 7 Help Forums
      My System SpecsSystem Spec

  3. #12


    Posts : 2
    Windows 7


    Thanks for the quick reply Brink! Yeah, I came across a solution that applied a quick repair to the reg file by adding a missing sub-folder, that being 'shell'. Now when I right click > open with > choose default program, I am no longer presented with an error message.
      My System SpecsSystem Spec

  4. #13


    Posts : 22,576
    64-bit Windows 10


    Perfect.
      My System SpecsSystem Spec

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Open with "Choose default program" Error - Fix
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