Have you ever been given a ppt file that was created on a 4:3 monitor, but you want to project it on a widescreen projector?  Usually when you project this type of file, there are black bars on the left and right sides of the screens and the content is still 4:3.

Here is how you can make the file widescreen.  Go to File – Page Setup, in the width and height boxes enter 16 for width and 9 for height.  Click ok and now your slides are widescreen.