3DS (file format)
From GICLWiki
File Type 3D Studio Scene
Category 3D Image Files
Common? No
File Description 3D image format used by Autodesk 3D Studio; contains mesh data, material attributes, bitmap references, smoothing group data, viewport configurations, camera locations, and lighting information; may also include object animation data.
Consists of blocks of data called "chunks" that contain an ID and length description; chunks store the shapes, lighting, a viewing information that together represent the three-dimensional scene.