CAD music files? Are you mistaken? If you are talking about the cda format on a CD, it is not actually a real music file. You can use any player, such as Qianqianjingting or the Windows Media that comes with the system. player to play the cda on the disc. But note that if you copy this file to other places, it will definitely not be played.

To play in addition to CDs, you must use a player to convert it to other formats such as mp3 (of course, if there is other software to make a CD image in ISO format, it is also possible)