It's a link to a website with Xaudio librairies for FreePascal (compatible with BP7) under DOS. With it, decoding MP3 file to WAV file, it's easy. But if you want to play MP3 file, you must use DOS drivers like MIDAS librairies (on this website).
Send me e-mail if you known play MP3 file with this librairie.
It's a gift for all Programmers Heaven members !