Oh, they weren’t mp3 files. Iirc it was stuff like darude-sandstorm-live-mp3.exe or eminem-without-me-mp3.exe.
It wasn’t Napster’s fault, ISDN at the time was what most people had. 1 internet + 1 phone line. You got online with max 68 Kbps. Bundling both lines got you 128 Kbps, then the phone line would be obviously busy giving you more speed, rendering the phone unusable.
Those were fun times in households with more than 1 member.