Just installed Lion on 2009 MacBook Pro moved from Snow Leopard - img. copies of movies will not play on DVD player

I have a MacBook Pro 2009.   In order to get iCloud I have moved to Lion.   Mountain Lion will slow machine too much.  I now find that DVD player will not play the Disc Image  .img  movie files.  When I open DVD player and click File and Open DVD Media, the Disc Image files are greyed out.  The .dvdproj files are not greyed but if I click on them I get a message that "the media type is not supported".   I could play the movies without any problem before I switched to Lion.  The switch was done at the Apple store by an Apple Technician.    Any idea what is happening?

Download and install VLC. http://www.videolan.org/vlc/index.html and get rid of DivX.

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