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

In C#:

public bool Is64bit() {
    return Marshal.SizeOf(typeof(IntPtr)) == 8;
}

In VB.NET:

Public Function Is64bit() As Boolean
   If Marshal.SizeOf(GetType(IntPtr)) = 8 Then Return True
   Return False
End Function

Answer 2

I use this:

@echo off
if "%PROCESSOR_ARCHITECTURE%"=="AMD64" (
 echo 64 BIT
) else (
 echo 32 BIT
)

It works on Windows XP, tested it on Windows XP Professional Both 64 bit and 32 bit.

Answer 3

Here is a simpler method for batch scripts

    @echo off

    goto %PROCESSOR_ARCHITECTURE%

    :AMD64
    echo AMD64
    goto :EOF

    :x86 
    echo x86
    goto :EOF

Answer 4

From a batch script:

IF PROCESSOR_ARCHITECTURE == x86 AND
   PROCESSOR_ARCHITEW6432 NOT DEFINED THEN
   // OS is 32bit
ELSE
   // OS is 64bit
END IF

Using Windows API:

if (GetSystemWow64Directory(Directory, MaxDirectory) > 0) 
   // OS is 64bit
else
   // OS is 32bit

Sources:

1. HOWTO: Detect Process Bitness
2. GetSystemWow64Directory function

Answer 5

I used this within a login script to detect 64 bit Windows

if "%ProgramW6432%" == "%ProgramFiles%" goto is64flag

Answer 6

I tested the following batch file on Windows 7 x64/x86 and Windows XP x86 and it's fine, but I haven't tried Windows XP x64 yet, but this will probably work:

If Defined ProgramW6432 (Do x64 stuff or end if you are aiming for x86) else (Do x86 stuff or end if you are aiming for x64)