3ds Max can import and export the text-based (ASCII) Wavefront format OBJ. An OBJ file contains geometry descriptions, while the associated MTL file format contains material descriptions.
Note: The OBJ/MTL export/import plug-in is provided by software from GuruWare. Import and export of independent Wavefront MTL (material) files is not provided. Export and import of MTL files attached to OBJ files is fully supported.