Set Custom File Extension For W10

Description:

I haven’t done this yet, but I wanted to take notes for when I do this. Follow this guide to set custom file extensions in Windows 10.

To Resolve:

1. Setup computer the way you want

2. Run:

   dism /online /export-defaultappassociations:"C:\Temp\IE-DefaultBrowser.xml"
   

   • NOTE: DO NOT delete lines from this.

   • This didn’t work, what DID work was:

   Dism /Online /get-DefaultAppAssociations >C:\TEMP\DefaultApps.txt
   

   • Then just rename to XML.

3. On new computer:

   Dism.exe /online /import-defaultappassociations:c:\temp\CustomFileAssoc.xml
   

   • Your file will be copied in C:\Windows\System32 with the following name OEMDefaultAssociations.xml

4. Or through GPO:

   • Configure the following policy Set a default associations configuration file located in Computer\Policies\Administrative Templates\Windows Components\File Explorer

   • 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.

   • To control only some extensions, see the reference.

References:

“Windows 10 – How to configure file associations for IT Pros?”