(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