The HP Reverb G2 is a Windows Mixed Reality headset. This means that it uses the Windows Mixed Reality Portal. In this portal, the Microsoft store is the native app store. This store can be accessed from the portal. Steam has a Windows Mixed Reality plugin which makes it possible to use the HP Reverb G2 with SteamVR. Installing apps and games from Steam can be done via the desktop app, but not directly via the VR headset. After an app or game is installed, it can be accessed by the SteamVR portal.