File Extension MOO File Format Movie Clip Apple QuickTime MOO stands for Movie Clip Apple QuickTime. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Review: Shuffle off Apple you've been Clipped Apple fixes multiple QuickTime flaws What do you think about how Apple has handled the zero days and announcement to uninstall QuickTime?