An id4 file extension is related to the Infini-D a 3D rendering software. An id4 file contains scene.
ID4 file extension - Infini-D scene
What is id4 file? How to open id4 files?
File type specification:
The id4 file extension is associated with the Infini-D, a 3D computer graphics program developed by Specular International.
The id4 file stores 3D scene rendered by Infini-D.
The Inifini-D is obsolete product and Specular International is now owned by DAZ.