I can't guarantee it, but here's a basic indication. The case would be way too big for a Canon Powershot. It's definitely made to hold a DSLR with a telephoto lens--nothing smaller. My only concern would be the width. But looking at that make and model of camera on Amazon with the 18-135mm lens attached, I'm fairly sure it would fit and recommend it for your camera.
I'm not familiar with the D200, but any camera body similar in size to today's larger DLSR bodies should fit. The only thing to consider is the attached lens.. A lens larger than 55-70mm attached to the body will be a tight fit. For example, if I have a 70-210mm lens attached to my D7000, the case will not close securely (velcro enclosure).