How Windows 7 / Vista 64 Support 32 bit Applications

This article provides an overview of the Windows on Windows 64 (WOW64) sub-system and associated techniques that support 32 bit applications under Windows 7 / Vista 64.

The Enterprise and Ultimate versions of 64 bit Windows 7 will also support the use of a 32 bit Windows XP virtual machine, assuming your PC supports hardware virtualisation. This is available as an optional beta download with the Windows 7 release candidate. This technology is still under development as I have found that a number of applications that work fine on a real 32 bit XP PC will not work in the virtual machine.

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