FileNavigator 1.0 B - A Napster clone for Windows (Freeware)

[Peter Scott]

"FileNavigator is a Free Napster(tm) clone for the Windows95/98/NT/2000
platform. It not only allows the sharing of multiple filetypes, but
compensates the Artists and the Server Operators through a small,
unobtrusive, advertising banner at the bottom of the client."

http://www.filenavigator.com/

I haven't tried this yet, because the registration server is down, but it
does sound interesting.