How to- force focus power point viewer

Hi everyone, long time reader first time poster.
I was wondering if its possible to force the focus of a program to the front of the screen.

Ie. I've set IExplorer to automatically open .pps files in the viewer not the editor. But if you have other programs (besides IExplorer) in focus at the time they take priority/focus
In xp it did this by default (went full screen at the front of the screen). ppviewer would take precedence over anything else- but with 7 it goes to the back.

any ideas ?

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