apps opening behind other windows

#1
In XP, when I double-clicked on a file (.jpg, .wmv, etc.), it would open the applicable program on top of the explorer window that given file was in.

Now, in Win7 (x64), when I double-click one of those files, the app. (Windows Photo Viewer, WMP, etc.) is opening behind the explorer window.

Is there a setting I'm missing? Or is this another case of a registry key needing editing?
 


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