User Profile Manager is enabled. Inside a published desktop launch Outlook .Then click on an email address link  (MAILTO) or on a Hyperlink (HTTP/HTTPS) a popup dialog appears with options for "Citrix Metaframe Server FTA" , "Internet Explorer" or "Look for an app.."

As a workaround create the initial registry FTA entries with a local policy so that the FTA choice is set when the profile is created.

1. Choose a target machine with the same OS as the VDA.
Set the file type associations as desired in control panel.
Here set HTTP and HTTPS to use Internet Explorer.




2. Run the command Dism /Online /Export-DefaultAppAssociations:C:\AppAssocAttac.xml (this will create a XML file with the configurations of default programs for different file extensions )

Create a GPO or a local policy.
 
3.   Expand to the policy location , Computer configuration\Policies\Administrative Templates\Windows Components\File Explorer. 
4.   On the right side pane select the policy “Set a default associations configuration file” 


5.   Click on Enabled and then give the path of XML file in the options area. 

6.  Save settings and exit the policy editor enable loopback processing 

7.   Apply the policy to the OUs where the servers are placed. 
On VDA run  gpupdate /force so that changes would take effect immediately.

8.   Run RSOP.msc in the servers, and make sure the policies are properly applied.

9. Launch new HDX session . Try to open the link in Outlook. There is  no longer any prompt to open a http or https link whether in  Outlook or Wordpad.

Problem Cause