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by Lazonedo 860 days ago
It's indeed not the absolute first, but it's the 'first' among those that are still in use today and whose compatibility wasn't dropped (you can't run 16 bits software on 64 bits windows without a third party tool).

For better or worse, win32 is still relevant today, and many latter UI layers were wrappers over it (MFC, WTL, WinForms, WxWidgets, SWT [...])

win32 is by far the most enduring set of GUI APIs out there.