Hey, someone got you a connection! Cool.

I don't know for sure, this is just a wild guess, but I'll bet that's a track that hasn't yet been compiled into an MP3 yet. The player assigns FIDs to tracks that were ripped and are now waiting for the background process to get around to encoding them. Dial back in in a few minutes and it'll probably be a more normal FID type.

That's my guess, anyway...