It looks like it only works with Windows (not NT) and Mac OS 9
"It connects to any host computer running Windows 98 SE, Millennium Edition, or 2000. Alternatively, you can integrate it into a Macintosh OS 9-based network, but the changer doesn't yet work with Mac OS X."
There is some information at: http://pcworld.about.com/news/Jan192001id38742.htm
The Powerfile relies on MediaFinder software to access the discs inside the changer. If you can figure out what commands MediaFinder sends to access the discs you would have a start on the solution.