How do I run exe based on Windows bit size?

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QUESTION :

I have two .exe files, and I would like to create one program that will be able to run one of them based on the Windows bit size (ie, run program1.exe if 64-bit and run program2.exe if 32-bit). Does anyone know where I should start looking?

ANSWER :

You could use a simple windows Powershell script as your launcher.

Here’s how you can tell your architechure from PS:
http://depsharee.blogspot.com/2011/06/how-do-detect-operating-system.html

The idea is to check how many bytes long the IntPtr structure is. 4=> 32b, 8 => 64b.

If you really want an exe, in DotNet, you could use this check to determine if its 64b:

BOOL Is64BitWindows() {
 #if defined(_WIN64)
  return TRUE;  // 64-bit programs run only on Win64
 #elif defined(_WIN32)
  // 32-bit programs run on both 32-bit and 64-bit Windows
  // so must sniff
  BOOL f64 = FALSE;
  return IsWow64Process(GetCurrentProcess(), &f64) && f64;
 #else
  return FALSE; // Win64 does not support Win16
 #endif
}

more info here: http://blogs.msdn.com/b/oldnewthing/archive/2005/02/01/364563.aspx

You can always check the %programfiles(x86)% environment variable. If it’s a Windows 64-bit machine it will return the path to “Program Files (x86)”, if it’s not 64-bit it won’t be defined and will just return “%programfiles(x86)%”.

You can check this with a batch, PS, .Net, or whatever you’d like. 🙂

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