我发现在安装了新的DirectX SDK Dec 2005后编译DirectShow应用程序时提示无法找到dhsow.h这个文件，觉得非常奇怪，于是上网找原因，很快，在一个论坛看到了这样的消息：
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Re: Still can't run DirectShow with 2005   
On Wed, 11 Jan 2006 06:02:02 -0800, Udi Raz wrote:
> I installed Dec 2005 version of DirectX SDk
>
> 1. no directShow samples
> 2. still can't find header files as my application request.
>
> Any suggestions ?
Dshow has been moved to the Platform SDK. This topic has been covered many
times. Try a Google Groups search and see my FAQ.

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Date:Wed, 11 Jan 2006 08:20:31 -0700   Author:  
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看来在这个版本的DirectX中已经把DirectShow支持去掉了，转而放在了Platform SDK中，所以要开发DirectShow应用程序需要安装最新的Windows Platform SDK （真是个大家伙）。