have you tried my Floating Page library? Here is an old DEMO.
I could integrate that into Document Explorer as a Preview context menu option, so with rightlick you could open another Page temporarily in a Window. I wanted to do this sooner or later, but if it just makes sense, like i said before, i just don’t want to add features to make the code unnecesserily complicated. Give FloatingPage (Proof of Concept) a try and tell me if it’s that what you have though of?