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If the primary display on Windows is set to a scaling factor different than 100%, the only mode working correctly is Fullscreen on Armagetronad 0.4. Windows size gets increased by the scale factor, the contents blurrily scaled up. Even 0.2 fullscreen gets sized up, which of course makes the display larger than the actual screen and useless. Blurry, too.

Solution: Embed a manifest file that pretends we're perfectly DPI aware. That way, we get to keep our pixel sizes. Pretend we're "per monitor DPI aware" for that. "system DPI aware" only gets the correct behavior on the primary monitor, the game still gets resized and blurrily scaled if it is moved to a side monitor with different scaling.