Usually, right clicking on a file, selecting "Open with" followed by "Choose another app..." brings up the following menu which also includes installed apps, so that one may be set as the default application for the file type:

Program List

However, when trying to open a file using a Windows 10 Store app and the above method, the app is not listed. I can open the app, then open the file from within it, however this is less convenient.

So far I have tried to use the app's exe file (CodeWriter.exe), but this does not work without an app container.

To reitterate - I am not asking for suggestions for workarounds as I can open the file; I am specifcally asking how to set a store app as the default application when it is not in the above list.


The store app has to make the registration in this registry key:


And then set the File association\Capabilities in another key, mentioning each file type it can handle. For example Microsoft Edge has the registration here.

HKEY_CURRENT_USER\SOFTWARE\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages\Microsoft.MicrosoftEdge_25.10586.0.0_neutral__8wekyb3d8bbwe\MicrosoftEdge\Capabilities\FileAssociations

If you can post the export of RegisteredApplications branch, I can make a REG file which adds the FileAssociations info for that application.

With this done, the application should be normally displayed in the Open with.. dialog, as well as in Default Apps.

Update (May 3 2016):

You can use this REG file to add .CONF file type, using the same association setting for CodeWriter .txt file type.

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\SOFTWARE\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages\ActiproSoftwareLLC.562882FEEB491_2.5.17.17_neutral__24pqs290vpjk0\App\Capabilities\FileAssociations]

Pls note that you need to take ownership of the above registry key, add yourself full Permissions, then merge the REG file. Once done, reverse the Permissions to defaults.

Note: This REG file is valid for the current version (as of this post) of Code Writer. If you have any other version, make the modification in the appropriate key.

The key might have the following naming/numbering convention or similar.


  • Here's a link to the export, thanks for the help. May I also request you explain how you will add the FileAssociations in your answer for the benefit of anyone else who has the same question in the future. Link: onedrive.live.com/… – Sam3000 Apr 29 '16 at 16:42
  • Sure. What are the file extension you want the program handle? – w32sh Apr 29 '16 at 16:50
  • Its a .conf file, (the netbeans.conf if you're interested) – Sam3000 Apr 29 '16 at 17:13
  • Code Writer doesn't seem to install here.. the download/install process gets stuck. So making a REG might take some time... – w32sh May 1 '16 at 8:59
  • Then rather than take up your time, I'll just use another program and mark this as answered, thank you for your help though! – Sam3000 May 1 '16 at 13:11

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