Well it has to be in a shared folder accessible thu one of the P2P services....as i read it....but that extension would be next....and likely....
Hattip to Groklaw for this....by the way....
The Impression I got that even if you don't know about the music files on your hard drive you can be sued because of your ISP.
That tells me that anyone with a wireless router have better secure it. ASAP before the RIAA comes knocking on your door.