I have also played with the Rio Receiver software that lets you stream files from that software to Winamp and I have a strong feeling that Winamp did accept (and displayed) Id3 tag info from the Rio Receiver software.

It may be that the RioReceiver software puts the ID3 tag up front in the stream [or manufactures it from the database information on the fly before it streams the file out.

roger might be able to confirm this point as he is the one who has had a large amount of involvement in the empeg team with the Rio Receiver Software - visit the unofficial Rio Receiver BBS for Rogers posts on this subject late last year.