3D Viewer App in Windows 11/10 opens .3mf files & allows you to open 3D models & then capture it with Mixed Reality video.

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1] 3D Viewer 3D Viewer is the default 3D file viewer app that you get in Windows 10. It lets you view 3D models of different formats such as STL, FBX, GLTF, OBJ, and other files.