I'd say that's a Windows 3 era custom implementation of a file dialog, using fine grained controls that have nicely modernised. The buttons and the scroll bars certainly aren't contemporary with that cute folder control.
In a way I see it as a demonstration of how it should be: the UI intended at the time of writing is presented using current controls.
But even the text is broken. The text in the window title bar is way sharper than the blurry mess in the window. If the text isn't even the right resolution, it's not using "current controls".
Oh, didn't even notice the title bar sharpness. The scaled new buttons look even worse than the scaled old pixel font elsewhere. But that doesn't really change the way I read that example, it's an old UI, running on new controls (where they have remained in maintenance, e.g. the button). Scaling is done to the whole window, including still-current controls, because the old code is free to do framebuffer-level work.
Some were still in Windows 10.
https://old.reddit.com/r/Windows10/comments/l85hsx/windows_3...