Civilization II

Natively supported. The game runs in a maximized window at your desktop resolution.

If you are using one of the three lower widescreen resolutions, then the "view city" screen is anamorphic.
Anything higher, and it gets pushed to the left with a black bar drawn to its right.
Also, the game has some other sub-screens that are not meant to be windowed, such as the throne room and space ship, and they become windowboxed.
All of these are just beauty shots, and have no meaningful impact to gameplay.

CivII has an extensive GUI, but it doesn't really have a HUD. Nothing in this game stretches. Most of the "sub-screens" you use are rendered in a movable window. Some of the FMVs are windowboxed. Others, mainly the FMVs that show when you complete a major project, or when you consult the high council, are rendered in a movable window.