Detect whether current Windows version is 32 bit or 64 bit

Question

Believe it or not, my installer is so old that it doesn\'t have an option to detect the 64-bit version of Windows.

Is there a Windows DLL call or (even better) an en

Answer 1

Another way created by eGerman that uses PE numbers of compiled executables (does not rely on registry records or environment variables):

@echo off &setlocal


call :getPETarget "%SystemRoot%\explorer.exe"


if "%=ExitCode%" EQU "00008664" (
    echo x64
) else (
    if "%=ExitCode%" EQU "0000014C" (
        echo x32
    ) else (
        echo undefined
    )
)


goto :eof


:getPETarget FilePath
:: ~~~~~~~~~~~~~~~~~~~~~~
:: Errorlevel
::   0 Success
::   1 File Not Found
::   2 Wrong Magic Number
::   3 Out Of Scope
::   4 No PE File
:: ~~~~~~~~~~~~~~~~~~~~~~
:: =ExitCode
::   CPU identifier

setlocal DisableDelayedExpansion
set "File=%~1"
set Cmp="%temp%\%random%.%random%.1KB"
set Dmp="%temp%\%random%.%random%.dmp"

REM write 1024 times 'A' into a temporary file
if exist "%File%" (
  >%Cmp% (
    for /l %%i in (1 1 32) do !Dmp! (
  for /f "skip=1 tokens=1,2 delims=: " %%i in ('fc /b "!File!" !Cmp!^|findstr /vbi "FC:"') do (
    set /a "Y=0x%%i"
    for /l %%k in (!X! 1 !Y!) do echo 41
    set /a "X=Y+2"
    echo %%j
  )
)
del !Cmp!

REM read certain values out of the HEX dump
set "err="