Supported 3D File Formats
From Nevercenter 3D Modeling Wiki
Supported 3D file loading formats are *.sib, *.sia, *.obj, *.fac, *.3ds, and *.dxf.
Supported 3D file saving formats are *.sib, *.sia, *.obj, *.fac, *.3ds, *.dxf, *.stl, *.rib, and *.pov.