NameSpace ‘Microsoft.Policies.WindowsStore’ Error

Microsoft.Policies.WindowsStore KB ID 0001817


While working in the Group Policy Management tool, upon expanding administrative templates I got this error.

Group Policy Microsoft.Policies.WindowsStore error

Namespace ‘Microsoft.Policies.WindowsStore’ is already defined as the target namespace for another file in the store.

Solution: Microsoft.Policies.WindowsStore Error

This is because in your policy definitions there are two (four actually) files that are pointing to the same thing, and it’s not sure what to do. For central policy each “set of settings’ needs a setting file (ADMX) and a language file (ADML). there used to be one called WinStoreUI, and it was superseded (with an update) by WindowsStore.

The problem is the old WinstoreUI file is still in the definitions folder and both old an new are being read. You can safely ignore the error popup, but it will bug you every time you open administrative templates.

To demonstrate, two ADMX files.


WindowsStore and WinStoreUI

And two ADML files.

WindowsStore and WinStoreUI ADML

Note: ADML files live in the language sub-folder in the policy definitions folder (in my case en-us), if you are elsewhere in the world your locale folder will have a different name).

All you need to do to fix the problem is delete the WinStoreUI files, firstly the WindStoreUI.adml file


Delete WinStoreUI ADML

Then the WinStoreUI.admx file. Restart the Group Policy management console, and the error should have ceased.

Delete WinStoreUI ADMX

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Author: PeteLong

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