These classes are for seemless integration of the MMIO procedures for MP3 and OGG files written by Russel O'Connor http://www.math.berkeley.edu/~roconnor/
After installation Ogg- and MP3 files are treated the same way by the WPS as the other audio files. They have their own Icons and the same menus as for example wave files. A doubleclick starts playback another one stops it. The convert menu item helps you decoding the file to wave without any other program. There's also a new open-item for volume.
The settings notebook of every audio file gets a new page added describing the audio characteristics like playtime or samplerate and you may view and change the ID3 tags of MP3 files using the settings notebook.
http://www.os2world.com/cdwriting/
Source: