Windows 10 all icon resolutions on all DPI settings? Format? Pixel art as icon? Large size icon in start menu medium tile?

Question

Just skip to the answer at the answer section, the question part has speculations and mistakes. The answer is based on experiment and it is accurate.

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Answer 1

The icons you see in Windows 10 are packed into a icon font named Segoe MDL2 Assets & all built-in UWP apps like Groove Music are using this font for icons. Also some apps in the Windows store using it.