Setting Default browser in 2016 in Citrix environment

Recently a new Citrix enviromnment was put in place. The server are Windows server 2016 .
When users login and try to access a website link for example: they are prompted "How do you want to open this website? but they have no choices. ( I =attached a screen shot of this prompt )
Basically they have no default web browser configured.
Also I then went to control panel and chose IE11 as the default browser, then everything works until the user logs off and then logs back in again.
How can I get this setting to stick ?
It doesn't work for Admins either
No other Browsers have been installed on the server.
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James RankinCommented:
Set it in a custom default profile - this article, about halfway through, discusses using a custom default user profile - or this one, 

There is a GPO you can use for default file type associations, but this will override anything set by the user so may not be suitable.

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EkuskowskiAuthor Commented:
The GPO actually worked perfectly for what I needed.
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