How Can I Clear The Recent Files From The Movie Player Menu in 12.04?

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http://askubuntu.com – In 12.04 Live-USB, I use Movie Player to watch movie or music video. All of the movie/music-video titles that I have seen using the Movie Player are appears on the menu (under the Movie tab). How to clear this list and how to prevent Movie Player from showing this list anymore? I already try the "Delete History" from the "Privacy" option in "System Settings" but it doesn't work. (HowTos)