XAIO-C3 symbol for schematic?

I’m using k-cad to build up some small boards, and I’d like to add a symbol(schematic) and footprint(PCB).

The files I see on the Seeed page, seem to contain a *.sym file, but it doesn’t open so I don’t know what it is.

Are these files out there? Am I missing something? I’m using k-cad ver. 10, so maybe it’s a version issue?