Video not playing in IE


I've created a course in Storyline. The course has an MP4 video inserted in it. The video is only 1.6MB. When I play the published output in the clients browser - IE9 (I know it should be upgraded) the video doesn't play. It will play in Chrome. I have also inserted a .avi file and a windows media file. None play in IE9. 

Any ideas?



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