Through VorpX you can play many 3d games in VR.
Not Freeware ( but... you know ;) )
VorpX
Tested on PICO 4 Ultra.
1. Install VorpX, launch it.
2. Need to create new profile for Wolfcamql.exe:
Go Menu->Configure VorpX->Local Profiles->Select "Quake III Arena"->Create a new profile based on this one->Check All 4 check Boxes->Select created profile->Add File->Choose wolfcamQl.exe-> Apply and Close
3. Launch Wolfcamql->Press DEL on keyboard
If you can't watch demos (big square texture in the middle of the screen while in "Geometry 3d MODE") or your FPS during watching too low (but you have good PC).
4. In VorpX menu set 3D Geometry OFF (turn off 3D ) You should see wolfcamQl main menu and be able to select Settings.
5. Reset all Wolfcamql settings to default through main menu.
6. Go Settings->System-> Turn off GLextensions->Choose 16:9->Choose 3840x2190->Accept
7. Select demo and play it->press DEL->turn ON 3D Geometry