FBX - Autodesk FBX Interchange File
This file type is used to save 2D or 3D drawings created with various Autodesk software packages. It retains the full functionality and fidelity of the original file and can be opened, read and edited by many different programs. It is used to create interoperability between different 3D applications. These files can also be converted from OBJ, DX, 3DS and COLLADA (DAE) formats with a free FBX software conversion utility.