Why Has the class ID Changed? The correct class ID for Windows Media Player 7 and later is: clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6. Many places on the internet it states that the class ID should be: clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95. This class ID is the old one, but it will work, because of backward compability. However, if you use the old class ID you will not be able to use the n..