swa to mp3

got swa file that can't be played by microsoft media player.
It's interesting that no conversion is needed. Neither do I need to download micromedia player.
Just...RENAME the file to .mp3 file, voila.. It's MP3 file.
The compression algorithms used to convert to swa are the same as for mp3, the only difference is something in the file header.
"the conversion doesn't work both ways..... like I said there is a difference in the file headers. Strangely this difference allows MP3 players to recognise renamed SWA files, but not the other way around."
Interesting...