網路上有些影片聲音部分需要Ogg Vorbis Mode 3+(6771)的codec才能解碼，通常用Windows Media Player可以看到在播放的片名旁邊有個紅X，顯示錯誤訊息如下：
You've encountered an error message C00D10D1 while using Windows Media Player. The following information might help you troubleshoot the issue.
Codec is missing
Windows Media Player cannot play the file (or cannot play either the audio or video portion of the file) because the Ogg Vorbis Mode 3+ (6771) codec is not installed on your computer.
經過不斷尋找及實際測試後終於找到了下面這篇文章
http://www.moviecodec.com/topics/6234p1.html
裡面提到可在這邊下載及安裝vorbis.acm
http://svn.xiph.org/tags/vorbis/vorbisacm_20020708/
在 vorbisacm.inf 按滑鼠右鍵 ，然後選安裝。
安裝後終於可以聽到聲音了！
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