Convert Nastran Superelement to Abaqus Stiffness Matrix

Good Morning,

I've been given a Nastran superelement file (.pch) and would like to convert it to an Abaqus stiffness matrix so that I can run it!

The Abaqus fromnastran command doesn't specify .pch as a file type in can handle.

Anyone got any quick/easy ways to do this?

Cheers :)