Time to pull out the owner's manual and start reading Chapter 10.
What little I looked at it, not sure you're going to get it working from the mini without installing Windows. Everything points to requiring WMP 11 or a DLNA server.
Under "Note:" on page 74:
Video files cannot be played back.
Audio, photos and internet radio are a possibility.
You'll also need to read the section on setting up the receiver to get it's IP address from the router (your DHCP server).
Unless someone comes along here familiar with that receiver, you might want to do some searching/reading over at
AVS forums. Maybe see if you can find a Pioneer specific forum also.
Even in either one of those, they'll expect you to be somewhat familiar with that section of the manual.