Definition: 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