This is because the Cool Me program sets the default music player as the Cool Me music box, so you only need to change the settings of the default player. You can modify the option settings in Cool Me (in the upper right corner of Cool Me, there is a label with an inverted triangle pattern in it. Click this to find the option settings)-file association, that is, tick off the √ in front of the file. It can also be modified in 360 Security Guard-Functional Encyclopedia-Default Software Settings-Default Music Player Settings.