Group policy - Trying to set default applications through AppAssoc.xml does not work

I am trying to set my default browser on our remote desktops (server 2016 farm) to Firefox.  

I have followed the KB article of adding to a GPO and creating a Appossoc.xml to be used  Stored the file on the file server in a folder accessible to everyone.

Issue is it does not apply and nothing changes on the user side.

Am I missing something, any ideas?

<?xml version="1.0" encoding="UTF-8"?>
<DefaultAssociations>
  <Association Identifier=".htm" ProgId="FirefoxHTML" ApplicationName="Firefox" />
  <Association Identifier=".html" ProgId="FirefoxHTML" ApplicationName="Firefox" />
  <Association Identifier=".shtml" ProgId="FirefoxHTML" ApplicationName="Firefox" />

  <Association Identifier=".website" ProgId="FirefoxHTML" ApplicationName="Firefox" />

  <Association Identifier=".xht" ProgId="FirefoxHTML" ApplicationName="Firefox" />
  <Association Identifier=".xhtml" ProgId="FirefoxHTML" ApplicationName="Firefox" />
  <Association Identifier="ftp" ProgId="FirefoxURL" ApplicationName="Firefox" />
  <Association Identifier="http" ProgId="FirefoxURL" ApplicationName="Firefox" />
  <Association Identifier="https" ProgId="FirefoxURL" ApplicationName="Firefox" />
</DefaultAssociations>
OllecoTechyAsked:
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Michael B. SmithManaging ConsultantCommented:
Did you create this manually? Or did you create it by exporting from a machine where Firefox is already set as the browser? Your XML looks correct, but the only way to be certain is to do the export:

Dism /Online /Export-DefaultAppAssociations:c:\temp\associations.xml

Open in new window

Then edit the file and remove the associations you aren't interested in using.
OllecoTechyAuthor Commented:
Hi Michael,

I originaly exported through my profile on the RD box after changing the defaults (below).  But on a little investigation all of the example I found are like the one I posted before. Both do not work....

First version:
<?xml version="1.0" encoding="UTF-8"?>
<DefaultAssociations>
  <Association Identifier=".htm" ProgId="FirefoxHTML-308046B0AF4A39CB" ApplicationName="Firefox" />
  <Association Identifier=".html" ProgId="FirefoxHTML-308046B0AF4A39CB" ApplicationName="Firefox" />
  <Association Identifier=".shtml" ProgId="FirefoxHTML-308046B0AF4A39CB" ApplicationName="Firefox" />

  <Association Identifier=".website" ProgId="FirefoxHTML" ApplicationName="Firefox" />

  <Association Identifier=".xht" ProgId="FirefoxHTML-308046B0AF4A39CB" ApplicationName="Firefox" />
  <Association Identifier=".xhtml" ProgId="FirefoxHTML-308046B0AF4A39CB" ApplicationName="Firefox" />
  <Association Identifier="ftp" ProgId="FirefoxURL-308046B0AF4A39CB" ApplicationName="Firefox" />
  <Association Identifier="http" ProgId="FirefoxURL-308046B0AF4A39CB" ApplicationName="Firefox" />
  <Association Identifier="https" ProgId="FirefoxURL-308046B0AF4A39CB" ApplicationName="Firefox" />
</DefaultAssociations>
OllecoTechyAuthor Commented:
Had to restart box for policy to apply, who would have guessed!!!!

Steven

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