It seems that the Pico 4 is only intended as a standalone VR headset. It does NOT support Windows Open XR, and it has been confirmed to me by Steam that they do NOT support the Pico 4. Hopefully, with updates that will change. I have Virtual Desktop and FSVR will not start (No headset detected, and no support for Open XR). I have tried starting it through Steam VR, and it will not work through that? As said Steam will NOT give support, so no help there. The Steam ‘Non Steam Games’ list does NOT show MSFS in its list ( Microsoft Store Version) to add, why I don’t know, it shows everything else? I have tried loads of ways to get the Pico 4 to work in FSVR, but have failed. Pity, it is a very good VR headset, especially for stand alone use.