Update: In this version I've added an "ExcludeWindowTitleBar" property (to remove the title bar when capturing a window) and a "SetCaptureRegion" function where you can specify a rectangular region to capture from either a window or the whole monitor. The following screenshot shows the capture of a 400x300 region with the top left corner at the (100:200) coordinates relative to the window being captured:

Name:  WindowsGraphicsCapture3.jpg
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As usual you can download this latest update from the first post above.