How to play *.mp4 in Silverlight (locally - no server)?

How to play *.mp4 in开发者_开发问答 Silverlight (localy - no server)? I have a file How to play itr using xaml and c#

The only way to do this is via a full-trust Silverlight 4 out-of-browser application - otherwise, Silverlight will not be able to access the file