With this type of product you will be able to hear the audio and read the book on your computer at the same time. Sometimes there is also extra information on the subject added to the disc.
This means that the audio files may be zipped to save space on the disc for more information.
You will have to unzip the files on your computer to listen to them using something like WinZip which is free from there web site.
Unfortunately they will not work directly onto a normal CD player and as such you will not be able to hear anything on your CD player.
Nevertheless, with all the extra information in PDF and/or Word format it far makes up for that.
Although each chapter of the book could be spoken by different people and with different cultural and language perspectives.