I can only find the string <!-- Use 1, 2, 3 as identifiers for audio, images, video since some players may require for binding to the remote --> in 2 places in my profiles.xml file. Neither relate to the WDTVLive profile.
In my profiles.xml the WDTVLive entry starts with-
<profile id=“AFF1181A-E47F-4c36-AB1D-68C00E71C096”> <!-- This profile has to come after the samsung -->
<!-- The container identifier media players of this profile expect
<contentDirectory audio=“0\Music” photo=“0\Photo” video=“0\Movie” />