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However, on the IA-64 architecture, WOW64 was required to translate 32-bit x86 instructions into their 64-bit IA-64 equivalents which in some cases were implemented in quite different ways so that the processor could execute them. Since the AMD64 architecture includes hardware-level support for 32-bit instructions, WOW64 simply switches the process between 32- and 64-bit modes. It was first employed in Windows XP 64-bit Edition, but then reused for the “圆4 Editions” of Windows XP and Windows Server 2003. Windows XP 圆4 Edition uses a technology named WOW64, which permits the execution of 32-bit x86 applications.
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