Citation :
Microsoft has done away with some legacy components, such as the Win16 sub-system16-bit Windows code is not supported on the 64-bit version of Windows. The POSIX and OS/2 sub-systems are also not supported. There is a new sub-system though, called WOW64. WOW64 is short for Windows-32-on-Windows-64. It provides 32-bit emulation for existing 32-bit applications, enabling most 32-bit applications to run on the 64-bit version of Windows without modification. It is similar to the old WOW32 sub-system, which was responsible for running 16-bit code under the 32-bit version of Windows.
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