Well, it may be because the relevant software for playing MP3 does not cause the icon to become like this~

There are also ways to change the icon~

Some Changing the icon may cause system problems, so generally speaking: 1: Right-click the file that needs to change the icon--Properties--Customize--Change icon--After selecting the icon--OK--then click OK ;2: If you want to be more personalized, it is better to install some software that changes the system interface. For example, install some Apple interfaces. There are quite a lot of them online. Go check it out~

If it helps, please adopt it. Oh~~~~~~~