WoW64 (Windows 32-bit On Windows 64-bit) is a subsystem of the Windows operating system that is capable of running 32-bit applications and is included on all 64-bit versions of Windows — including Windows 2000 Limited Edition, Windows XP Professional x64 Edition, IA-64 and x64 versions of Windows Server 2003, 64-bit versions of Windows Vista and Windows Server 2008, as well as the 64-bit edition of Windows 7. In Windows Server 2008 R2 Server Core, it's an optional component. WoW64 is designed to take care of many of the differences between 32-bit Windows and 64-bit Windows, particularly involving structural changes to Windows itself.
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main source : http://en.wikipedia.org/wiki/WoW64
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