The numbers is just probably some ID of the download. But its the correct file. You will know it is correct once you find this code, it is located on top of the file:
<Image Source="http://localhost/Yougrids_Demo/images/yj_piecemaker/piecemaker2.png" Title="Title for slide2">
<Text><h1>This is your second slide info title</h1> <p> You can use p or h1 element tag to define your custom description</p></Text></Image>
<Video Source="http://localhost/Yougrids_Demo/images/yj_piecemaker/video.flv" Title="Video Example" Width="900" Height="360" Autoplay="true">
You will see in the instructions that you need to put the node into Contents
which you can see in the code.