Free Developer: Windows Mixed Reality for SteamVR Preview

The launch of Windows Mixed Reality for SteamVR free for ALL developers, using ANY Windows Mixed Reality Headset, In Steam Store took place on the 15th November 2017

Please read the original thread Beta: Using SteamVR with Windows Mixed Reality as this contains information on loading using the Mixed Reality Portal Simulator and will allow the loading of free apps before transferring to WMR Headset.

All Windows Mixed Reality Immersive Headset's can play SteamVR apps.

Just to re-iterate_ BETA IS NOW OPEN TO ALL_ "This program as of 15th November 2017 is the Public release of the software in Preview to developers. In the Steam store!."
See the Controller layout Steam has provided in the article Using Windows Mixed Reality Controllers (Motion Controllers) on Steam VR Games

See Microsoft support page https://support.microsoft.com/en-us/help/4053622/windows-10-play-steamvr-games-in-windows-mixed-reality

My favorite is Google Earth VR
Click Play to download and install.

Make sure your controllers were upgraded and Windows Mixed Reality app started before launching the Google Earth VR App from within Steam.