If you have HyperLynx you can import pads .pcb file. Also you can ask whoever provided PADS file to create HYP file for you,
PADS .pcb file does not show as one of the options under Hyperlynx translate.
This is sustaining engineering on a shipping product, the team that did the design using PADS is no longer around.
Seems very odd that I can translate from a competitor's output but not from Mentor's own PADS output.