.fbx

Autodesk FBX, a proprietary 3D model interchange format used across animation and game pipelines

Dedicated renderer

Format facts

MIME type: application/vnd.autodesk.fbx
Apple UTI: custom
Stock Quick Look: partial stock preview
Planned approach (census): special-renderer
Icon hint: generic-icon
Prevalence: universal

Renderer note (from the census)

parse ASCII or binary FBX header

Gotchas: industry standard interchange