«Number» file extensions

3D File

3D Grapher Document

3D IMPACT! Project

Sierra LandDesigner 3D Design

Deep Exploration 5 CE Quicktime 3D Metafile

Serif 3DPlus

Autodesk Design

WorldBuilderBinary Document

ESRI ArcGlobe Document

Viewer Document

Rhino 3-D Model

3D Screen Saver Project