OK, I took the plunge and removed the window from the door! Removed the inside frame screws, which allowed the outer frame to be pried loose from the main window frame. The entire window assembly then removes from the outside of the door. BTW, definitely need a helper to hold the window on the outside - once the frame comes off the inside the entire window assembly floats inside the opening.
Once removed, I found that there are indeed two window panes. The outer tinted glass (of course) and an inner opaque sheet of either plastic or plexi-glass. Unfortunately, the opaque material is an integral part of the assembly - apparently glued to the frame. There is no way to take either pane away from the rest of the assembly once the factory stamps this thing together.
Possibly, one could cut up the opaque sheet using a hot knife and remove it in pieces. But that is a bold move that I'm not ready for at this time! It might be easier to just replace the whole window with a new clear-view tinted one. I see there is even one that provides an integrated shade (AP Products, Manufacturer Part No : 015-201512).
By the way, the window cutout opening is 22" x 12", with curved corners. Some of the replacement window kits I looked at will require me to cut the opening a little larger.
Pictures of the Windsport entrance door window assembly:
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