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chameleon81

macrumors 6502
Original poster
I'm looking for an application or method which will fit window size of an application to a predefined size.

For example I have Excel open and I have this application ready. I give the application parameters as 1280 x 720, app reduces / or increases the size of the Excel window to match the given size.
 
You could do it yourself with AppleScript. A quick Google search should show you how to size a window with it.
 
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