How to get list of codec installed on system via c program

Hi
I am trying to display the list of audio and video codec installed on my system
through c or c++ program. can any buddy help me on this topic.

it's again a Usenet faq.
ask on api newsgroup :
news://nntp.aioe.org/comp.os.ms-windows.programmer.win32
I don't know how to go there "news://nntp.aioe.org/comp.os.ms-windows.programmer.win32"
It's Usenet !
with Outlook Express
or
google groups
or etc...
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