I hope you have that machine on a separate VLAN that's completely firewalled, segregated from the rest of your network, with access to the internet but not the rest of your LAN.

Because if it does then other devices on your network would be potentially vulnerable.

I've worked with PC's that are out of support and the company too tightarse to pay for windows updates. The LAN cable was unplugged and you could only access it by physically being on the PC, but it won't work in your instance as you need the internet to play games.