Steam is the most widely used game launcher. It ships preinstalled and already configured on GLF OS. This page covers enabling the compatibility layer that Windows games need, and what to do when your games live on a separate drive.
Warning
This page is under construction and may be incomplete.
Note
Official website: https://store.steampowered.com

Undoubtedly the best-known launcher, Steam comes pre-configured and ready to use.
Note
If your games are stored on a separate drive from your operating system, you will need to mount that drive first.
To do this, you can use Nix Disk Manager.
Most Steam games are developed for Windows. You will therefore need to go through a compatibility layer.
Steam has provided for this in the settings.
Screen settings / compatibility + tutorial
All you have to do now is click on Play.