what you are seeking is a converter, not a server.
The mention by Tgrisham could be one, I saw another one called Legato as well. Googling for a USB to SPDIF converter will show more choices I'm sure.
Even a USB sound card will help if it/they have SPDIF output.
It's pick your poison time now. Each interface change over will yeild different sonics.
The bit perfect aspect for the hiface unit requires kernal streaming. Only the latest now 'beta' version of MC 15 has that support.
Fubar already had it as a selectable 'plug in' which is separately downloaded from the Fubar website along with the Fubar application.
Good luck.