High Quality Content by WIKIPEDIA articles! In computing, Windows on Windows - commonly referred to by its acronym WOW or WoW - is a software component of 32-bit versions of the Microsoft Windows NT family of operating systems that provides limited support for running legacy Win16 applications - applications written for Windows 3.x. Alternatively "WOW" may also refer to support for running 32-bit applications on 64-bit versions of Windows - known as WOW64.