Running %SystemRoot%\SysWOW64\cmd.exe will launch a 32 bit instance of CMD.exe even if the OS is 64 bit. %SystemRoot%\SysWoW64\cscript.exe C:\scripts\demo.vbs So for example to run a VBScript as a 32 bit process, use: To run a 32 bit program or utility on a 64 bit OS, the 32 bit executable file must be called from %SystemRoot%\SysWOW64\ %SystemRoot% = Windows installation folder, typically "C:\Windows" Run a 32 bit program %ProgramFiles(x86)% = 32 bit programs on 64 bit systems "C:\Program Files (x86)" %ProgramFiles% = 64 bit programs on 64 bit systems "C:\Program Files" File location environment variables %ProgramFiles% = 32 bit programs on 32 bit systems "C:\Program Files" If it’s not set, then you’re either in a 32-bit process on 32-bit Windows, or in a 64-bit process on 64-bit Windows. If it’s set, then you’re in a 32-bit process on 64-bit Windows, and can use SysNative. The PROCESSOR_ARCHITEW6432 environment variable. SysNative alias is not visible to 64 bit processes or programs and so cannot been seen in Windows Explorer. A 32 bit session can also access 32 bit files by directly referencing the sysWOW64 folder.īy default a 64 bit session will launch 64bit executables also from C:\Windows\System32\ but you can still choose to launch 32 bit executables by specifying sysWOW64. The dynamic sys folders will appear differently to a 32 bit session and a 64 bit session:īy default a 32 bit session will launch 32bit executables from C:\Windows\System32\ but, if the OS is 64 bit, then you can still choose to launch 64 bit executables by specifying SysNative. PowerShell.exe, CMD.exe and many other programs are available as both 32 bit or 64 bit. If ($env:PROCESSOR_ARCHITEW6432 -eq "AMD64") Ħ4 bit versions of Windows have dynamic system folders C:\Windows\sys* to support both 64 and 32 bit programs. You may often see incorrect suggestions that testing for the existence of files in \windows\SysWOW64 or \windows\System32 can be used to detect 32 bit or 64 bit, but this will not work - the redirector will make both locations appear present to 32 bit and 64 bit processes.
If not exist %SystemRoot%\SysNative\cscript.exe Echo 32 bit process If "%PROCESSOR_ARCHITEW6432%" = "AMD64" ECHO 32 bit process We can detect this with the PROCESSOR_ARCHITEW6432 variable, AMD64 = a 32 bit process under WOW64 mode: ::Is64BitOperatingSystem Detect a 64 bit Process Windows 10 on ARM includes an x86-on-ARM64 emulation, so the possible values for PROCESSOR_ARCHITECTURE are: AMD64 or IA64 or ARM64 or (for 32 bit) x86 Via David Wang’s blog post: Detect OS Bitness IF NOT DEFINED PROCESSOR_ARCHITEW6432 Set _os_bitness=32Įcho Operating System is %_os_bitness% bit In Vista and greater, you can use WMIC OS get osarchitecture, or in WMI/CIM Win32_ComputerSystem/OSArchitecture There is currently no known way of detecting this. Obviously a 64 bit OS must be running 64 bit hardware, but a 32 bit OS could also be running on 64 bit hardware. There are a number of promising looking options in WMI and Systeminfo, but they all pertain to the OS not the CPU. You can have a 64 bit CPU, a 64 bit operating system and a 64 bit process running. Before starting to look at this, its important to be clear about what you mean by "64 bit".
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