The intention of this document is to introduce developers to the new WTV file format. Below you will find a brief discussion on how to consume WTV files in a DirectShow graph for various operations on a WTV file such as trans-coding, playback, editing, etc.
The main audience of this document is developers familiar with C++ and DirectShow concepts.
http://msdn.microsoft.com/en-us/library/cc963726.aspx
Enjoy!