http://www.cinenow.com/us/article.php3/id%2C1601
Sounds like its possible they work like an external sound card. I guess they could read and decode the file, but hardware-wise there should be very little difference.
A new feature in the JVC receiver line is a USB-PC link that sends music from a PC to the receiver for playback, providing far superior sound quality when listening to music files compared to the performance of typical PC speakers . Some receivers offer a wired version, while others feature wireless playback using a transmitter that plugs into the PC's USB port and sends a 2.4GHz signal to a receiver in the same room for file playback.
Sounds like its possible they work like an external sound card. I guess they could read and decode the file, but hardware-wise there should be very little difference.