gnome-mplayer.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE default-apps SYSTEM "gnome-da-list.dtd">
<default-apps>

  <media-players>
    <media-player>
      <name>GNOME MPlayer</name>
      <executable>gnome-mplayer</executable>
      <command>gnome-mplayer</command>
      <icon-name>gnome-mplayer</icon-name>
      <run-in-terminal>false</run-in-terminal>
    </media-player>
  </media-players>

</default-apps>