Set a default associations configuration file

This policy specifies the path to a file (e.g. either stored locally or on a network location) that contains file type and protocol default application associations. This file can be created using the DISM tool.

For example:
Dism.exe /Online /Export-DefaultAppAssociations:C:\AppAssoc.txt

For more information, refer to the DISM documentation on TechNet.

If this group policy is enabled and the client machine is domain-joined, the file will be processed and default associations will be applied at logon time.

If the group policy is not configured, disabled, or the client machine is not domain-joined, no default associations will be applied at logon time.

If the policy is enabled, disabled, or not configured, users will still be able to override default file type and protocol associations.

Supported on: At least Windows Server 2012, Windows 8 or Windows RT
Default Associations Configuration File

Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Microsoft\Windows\System
Value NameDefaultAssociationsConfiguration
Value TypeREG_SZ
Default Valuec:\windows\system32\defaultassociations.xml

windowsexplorer.admx

Administrative Templates (Computers)

Administrative Templates (Users)