How to use act_runner on windows / for windows builds

I have some projects that I am developing for my company. I used to be able to build them on-premise, but recently the antivirus started interfering. I opened a ticket to fix this, but a fix is unlikely.

So I decided to set up a runner with windows to build the programs.
I already have an Ubuntu-latest runner, which works fine. What I am struggling with is how to set up the runner to use windows. I searched and found this image from GitHub to use as windows-latest
mcr.microsoft.com/dotnet/framework/aspnet:4.8-windowsservercore-ltsc2022 from here, but I have no clue on how (and where) to put this.

The runner is in a VM with a fresh windows install, but if it turns out that it is not needed, I can go with another way. My Linux runner is running in docker, using this image as the official one did not want to be used as an instance-wide runner, only for repository (haven’t tested orgs, as there are none on my server)

Any help is appreciated.

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