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WOW64Windows On Windows 64
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Emulated applications running within the Windows on Windows 64 (Wow64) layer are not able to address any more memory than they could on a 32-b system.
WoW64 enables 32-b programs to run the same as they would on a 32-b version of Windows by translating instructions passing in and out of 32-b applications into 64-b instructions.
Applications running on Windows Vista x64 may experience improved performance because of the larger amount of available memory, even if the application is running within the WOW64 layer.