Add icon to game on

I’m maintaining the installer for Freelancer and wondered how I can set the game icon so people see it when it’s installed? The banner is uploaded but I can’t work out how to set the game icon so it appears in lutris instead of a question mark. I can do it manually but wondered how to do it in the installer?

Other games I’ve looked at don’t have anything in the install script to set the icon yet the icon appears correctly. How can I upload a game icon?

It’s restricted to admins/mods atm

I have the same question. Any idea?