If 32-bit processor support is disabled in Windows Server 2008 R2, how does the operating system run 32-bit programs?
How does Windows 2008 R2 run 32-bit applications
32bit-64bitcpu-architecturewindows-server-2008-r2
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Best Answer
x64 CPUs can actually run 32-bit (x86) code in parallel to 64-bit code. The WOW64 layer of Windows translates the system calls of 32-bit programs to the 64-bit system routines.