opening VM's installed on proxmox in Gnome-Boxes using Spice Fedora 22 Possible?

[Iluciv]

Hi There
Believe this should be possible to associate opening the VM using Spice in Gnome-Boxes. I can open them successfully using Remote-Viewer on the same machine but when I select gnome-boxes it doesn't recognise the file:///tmp/znGmxi1n in boxes this is launching from the proxmox webbrowser hypervisor page.

Any tips would be greatly appreciated.

Thanks