What's more impressive is the creator of this started with zero programming knowledge, and learnt C in three days to start this project, and seemingly months learning the systems-level stuff to make this work. Insane.
Sounds like excellent hardware to run an old copy of Windows XP Media Player Edition!
Edit: okay so realistically that's probably not going to be of use to anyone until someone writes an audio driver for the HDMI out but maybe one of those USB sound cards will work at least?
Some people even got OS X running on these as a discounted albeit limited Mac. More practically you could do this in order to run “XBox Media Center” (aka Kodi) as it was named back then.
The reverse was also true when Apple released what was more or less the Apple TV interface as the Front Row app and some Macs even shipped with an IR remote. The same IR remote worked with several Macs of the time.
Eventually everything went to streaming and the software to support locally networked libraries became a side feature and eventually discontinued.
https://youtu.be/YkjrEXtZoWM?t=465