Why is widescreen 16:9 video playing back as standard format 4:3 when embedded in Powerpoint?

Hi folks,

After embedding widescreen video into a powerpoint presentation, it plays back in standard format.  How can I get my widescreen video that I embed in a .ppt to play back as a widescreen video in the .ppt?
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File > Page Set-up select custom and enter a width of 10 inches and a  
height of 5.625 inches.

and read the rest of the answer on http://www.officekb.com/Uwe/Forum.aspx/powerpoint/30320/how-do-I-set-up-a-powerpoint-slide-show-with-16-9-aspect-ratio

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