I'm not sure if it is a plugin or some other application but I remember several years ago I had a program that ran in the docker that would allow me to pick a color outside of corel using an eye dropper tool and would let me paste it into my corel document. Does this sound familiar to anyone?
In PhotoPaint X5, use the eyedropper from your colour palette to sample colours anywhere on your screen.
I use this. Works nice.