Running 32 Bit Compatibility Mode?

Protected mode is an operational mode of x86-compatible CPUs of the 80286 and later series. Protected mode has a number of new features designed to improve multitasking and stability of the system, such as memory protection, and hardware support for virtual memory and task switching.Sometimes abbreviated as p-mode and also called Protected Virtual Address Mode (Virtual Address Mode Protected) in the reference manual programmer iAPX 286 Intel (Note, iAPX 286 is just another name for the Intel 80286). In the 80386 and later processors 32-bit Added a paging system that is part of the protected mode

The WOW64 subsystem is a lightweight translation layer that has similar interfaces on all 64 bit versions of Windows.Its main purpose is to create a 32 bit to provide the necessary interfaces to allow 32 bit applications run without modification on 64-bit system. Technically, WOW64 is implemented using three dynamic link libraries (DLL): Wow64.dll, is the primary interface to the NT kernel that performs the translation between the calls of 32 and 64 bit, including manipulation of the pointer and the stack; Wow64win. dll, which provides the appropriate entry points for both 32 bit and Wow64cpu.dll, which takes care of changing the processor mode between 32 and 64 bit.

Although the outward appearance is similar in all 64 bit versions of Windows, WOW64 implementation varies depending on the processor architecture. For example, 64-bit version of Windows developed for the Intel Itanium 2 uses Wow64win.dll for emulation of x86 instructions into the instruction set only Itanium 2. This task is computationally expensive to Wow64win.dll functions in the x64 architecture, which changes as the processor 64-bit compatibility mode when you have to run 32 bit code, then switch back to 64 bit mode . WOW64 emulation not need to use x64.