The file reader supports Autodesk FBX files.
The Autodesk FBX format is a free platform-independent 3D authoring and interchange format that provides access to 3D content from most 3D vendors. FBX file format offers you improved interoperability between Autodesk Navisworks and a range of Autodesk products including Maya, 3DS MAX, and SoftImage.
The Autodesk Navisworks FBX file reader reads all 2D and 3D geometry, as well as texture maps and material maps. However, currently it does not support animation.