The file name was simply 163_33.DSN .
If you are working with a legacy design in : cadence orcad 163 33
A full-featured simulator used to verify circuit behavior before prototyping. OrCAD PCB Designer (Allegro): The file name was simply 163_33
The 16.3 release strengthened the bond between different tools in the Cadence portfolio: PSpice A/D cadence orcad 163 33