Footprint in Eagle

[DLW]

I want to make a PCB for an FV-1 EEPROM selector switch according to this schematic... http://www.hexeguitar.com/diy/utility/fv1progsel

It uses a BCK1001 rotary switch... https://www.newark.com/lorlin/bck1001/rotary-coded-sw-16p-hex-0-15a/dp/38AC0718

I contacted the switch manufacturer (Lorlin) to ask for a footprint. They gave me a .stp file. I guess this is a CAD file? Is there a way to convert this into a .lbr file that I can use in Eagle? Or is there another recommended way make the footprint?

There was a pedal that circulated through social media where a guy used a home etched daughter board to switch between 2 EEPROMs for his FV-1 build. It was rad. I'm hoping to make a fab'd PCB that I can share with the community.