To create a wrapper playlist by using the Windows Media Playlist Editor

In the console tree, click the publishing point to which you want to add a wrapper.
Click the Advertising tab, and then click Wrapper Editor.
Click Create playlist file, and then clear the Use the Create Wrapper Wizard check box.
On the toolbar, click the Add element button to add a media element to the wrapper playlist.

The Add Media Elements dialog box appears.

Specify the name and location of the content you want to add to the wrapper playlist. You can arrange the playback order by dragging elements in the playlist tree.
The %RequestURL% element is already a part of your playlist. It represents the content that the user requests from the publishing point. Playlist elements placed in front of the %RequestURL% element play before the publishing point content, while items placed after it play after the publishing point content ends.
Repeat steps 4 and 5 until you have added all of the content to your wrapper playlist.
On the toolbar, click Save playlist, and then specify the name and location of the wrapper playlist file. The wrapper playlist file must use a .wsx file name extension.

Note Image Notes

You can also create a wrapper playlist by using the Windows Media Playlist Editor on the Source tab. To create a new wrapper playlist in the Playlist Editor, on the File menu, point to New, and then click Wrapper Playlist. The Windows Media Playlist Editor is only available in the Windows Media Services snap-in.
If your playlist includes JPEG image files, do not include any syntax in your playlist that causes the image to pause while being rendered by the player. Pausing a JPEG image in this manner can cause the player to enter a permanent wait state. If you must show a still image under these circumstances, create a video file of that image and then use the video file in the playlist instead.