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Win32(1) A 32-bit version of Windows. Many editions of Windows have come in both 32-bit and 64-bit versions. See 32-bit computing and x86/x64.
(2) Win32 is the programming interface (API) for 32-bit and 64-bit Windows operating systems. Starting with Windows 95, developers write applications that call the routines in the Win32 API. See WinRT and UWP.
API Supports Windows UWP Win 10, Xbox, Surface Hub Hololens WinRT Win 8, Win RT Win32 95/98, NT, 2000, XP, 7, 8 and 10 Win32c 95 Win32s 95, 3.1 Win16 3.0, 3.1