I finally figured out how to play Armed and Dangerous on a widescreen monitor without any black bars. The WSGF has a solution, but it's only HOR+. It doesn't get rid of the black bars at the top and bottom.

However, I figured out how to use part of that patch to make it work. It's far from perfect, but I was finally able to play AaD and have it fill the screen (at least on Windows XP with my Nividia 9800gt. Hopefully it works on later versions of Windows and more modern video cards).

Here's the explanation of how I did it:
https://www.gog.com/forum/armed_and_dangerous/play_armed_and_dangerous_without_letterboxing_black_bars/post1