3D Object preview (3mf, fbx, glb, gltf, obj, ply, stl)

Is anyone currently getting this to work with windows 10 for objs and stls? For objs, the Directory Opus previewer is just showing me a list of vertexes. Stls are just showing up as the .stl icon instead of a model preview. I'm using windows version 1803, which meets Directory Opus's file requirements as far as I can tell. My Windows version does come with 3d Viewer (you mention "Mixed Reality Viewer"? in the description above) but I'm not seeing how to integrate that viewer into DOpus's explorer-replacement window. I'm unable to figure out how to get the functionality shown here in this video. Tips?