请问object classid 与embed type的对应关系

<object classid="CLSID:6BF52A52-394A-11D3-B153-00C04F79FAA6">

对应的embed type到底是多少，是application/x-oleobject吗？

Windows Media Player 10

clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6 (same as WMP7)
Windows Media Player 9

clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6 (same as WMP7)
Windows Media Player 7

clsid:6BF52A52-394A-11D3-B153-00C04F79FAA6

The version 7 control (now being called the Series 9 control) does not have an <embed> tag.

http://www.w3schools.com/media/media_playerref.asp

只有微软敢这么干.