Windows - Cpu (Instruction Set Architecture and word size - 32 or 64 Bit)

1 - About

Computer - Central processing unit (CPU) in Windows showing particularly:

In a 64 bit environment, you will find two environment by word size:
  • a 64 bit
  • and a 32 bit

You may then not able to see:

  • registry key
  • ODBC DSN connection

Just because when you start the default software it will be in a 64 bit form.

Just start the same software in the 32 bit directory and you will see them.

3 - Management

3.1 - Windows Operating System Location

Executable location by words size.

word size Mode Location
64 bit 32 bit C:\WINDOWS\SysWOW64
64 bit 64 bit C:\WINDOWS\system32
32 bit 32 bit C:\WINDOWS\system32

3.2 - How to get the architecture and word size

3.2.1 - Environment variable

Windows - Environment Variable



AMD64 is a synonym for a x86-64 processor

This is a x86 architecture with a 64 bit word

3.2.2 - Registry

Windows - Registry

To check the processor architecture, you have to:

  • open the registry. Tape regedit.exe in a command line (shell)
  • go to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
  • and check the value of PROCESSOR_ARCHITECTURE.

ie the following windows registry value:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\PROCESSOR_ARCHITECTURE

3.2.3 - System Information

Windows - System Information

msinfo32.exe has a “System Type” field.

In a command shell:


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