Changing monitor resolution with proper aspect ratio

My project size is 800x600 and I wanted to provide an option to the user to change their monitor resolution at 800x600 by clicking on button. I have also planned to do it by using buddy api xtra, and already tested it. The problem is, when I am doing this on a PC with panoramic monitor (native resolution 1920x1080), it got stretched. I know it's very natural (as the aspect ratio has changed ) and I can get it in shape by squeeze the width using 'draw.rect'.
I noticed, there are some PCs with advanced display card that don't even get stretched, but shows the 800x600 resolution in proper aspect ratio by keeping the extra space black both sides. And I don't need to write any further codes (squeeze the width using 'draw.rect') to keep it in shape.
The real problem starts here, I can't able to filter the above situations by any logical means. I wanted to write codes only for the PCs that get stretched, but I didn't able to find any support from Director to determine which type of display card has been attached. I need to know whether it will get stretched, or the display card can able to manage the aspect ratio.
Any one have any solution in this matter?
Please don't hesitate to ask if you need any more info.

Hello handler
If you talking about this kind of thing...
https://forums.adobe.com/message/5773207
search for..... _movie.stage.drawRect = _system.deskTopRectList[1] & _movie.stage.rect = _system.deskTopRectList[1]
You don't need an xtra to change the resolutions - but you do have to work a few things - I tend to use flash text because it scales better.
regards
milky

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hello,
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this will then show on a projector with a native resolution of 1280x800.
i do not want to crop the sides of two source files by half, but to crop them by a lesser amount to make a wider pairing that will play well with the projector's 16:10 aspect ratio, with no black banding.
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Changing monitor resolution with proper aspect ratio

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