How Can I Determine if a C# Process is 32-bit or 64-bit?

Determining the Bitness of a Process

In C#, determining whether a particular process is running in 32-bit or 64-bit mode is achieved through various methods.

IntPtr Size Check

The simplest approach involves checking the size of the IntPtr data type:

if (IntPtr.Size == 4)
{
    // 32-bit process
}
else if (IntPtr.Size == 8)
{
    // 64-bit process
}

WOW64 Check

To ascertain whether other processes are running in the 64-bit emulator (WOW64), consider the following code:

private static bool IsWin64Emulator(this Process process)
{
    if ((Environment.OSVersion.Version.Major > 5) || ((Environment.OSVersion.Version.Major == 5) && (Environment.OSVersion.Version.Minor >= 1)))
    {
        bool retVal;
        return NativeMethods.IsWow64Process(process.Handle, out retVal) && retVal;
    }

    return false; // not on 64-bit Windows Emulator
}

where NativeMethods.IsWow64Process is a DLL import:

[DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool IsWow64Process([In] IntPtr process, [Out] out bool wow64Process);

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