I think there was a period from Windows 3.1 to somewhere during Windows 98 (maybe right up until the release of Office 97?) where both first-party and third-party Windows apps were all expected to be built entirely in terms of the single built-in library of Win32 common controls; and where Windows was expected to supply common controls to suit every need.

This was mostly because we were just starting to see computers supporting large bitmapped screen resolutions at this point; but VRAM was still tiny during this period, and so drawing to off-screen buffers, and then compositing those buffers together, wasn't really a thing computers could afford to do while running at these high resolutions.

Windows GDI + COMCTL32, incl. their control drawing routines, their damage tracking for partial redraw, etc., were collectively optimized by some real x86-assembly wizards to do the absolute minimum amount of computation and blitting possible to overdraw just what had changed each frame, right onto the screen buffer.

On the other hand, what Windows didn't yet support in this era was DirectDraw — i.e. the ability of an app to reserve a part of the screen buffer to draw on itself (or to "run fullscreen" where Windows itself releases its screen-buffer entirely.) Windows apps were windowed apps; and the only way to draw into those windows was to tell Windows GDI to draw for you.

This gave developers of this era three options, if they wanted to create a graphical app or game that did something "fancy":

1. Make it a DOS app. You could do whatever you wanted, but it'd be higher-friction for Windows users (they'd have to essentially exit Windows to run your program), and you'd have to do all that UI-drawing assembly-wizardry yourself.

2. Create your own library of controls, that ultimately draw using GDI, the same way that the Windows common controls do. Or license some other vendor's library of controls. Where that vendor, out of a desire for their controls to be as widely-applicable as possible, probably designed them to blend in with the Windows common controls.

3. Give up and just use the Windows common controls. But be creative about it.

#3 is where games like Minesweeper and Chip's Challenge came from — they're both essentially just Windows built-in grid controls, where each cell contains a Windows built-in button control, where those buttons can be clicked to interact with the game, and where those buttons' image labels are then collectively updated (with icons from the program's own icon resources, I believe?) to display the new game state.

For better or worse, this period was thus when Microsoft was a tastemaker in UI design. Before this period, early Windows just looked like any other early graphical OS; and after this period, computers had become powerful enough to support redrawing arbitrary windowed UI at 60Hz through APIs like DirectDraw. It was only in this short time where compute and memory bottlenecks, plus a hard encapsulation boundary around the ability of apps to draw to the screen, forced basically every Windows app/game to "look like" a Windows app/game.

And so, necessarily, this is the period where all the best examples of what we remember as "Windows-paradigm UI design" come from.