how to detect OS architecture?

[John Colvin]

On Monday, 16 December 2013 at 10:54:15 UTC, Hugo Florentino 
wrote:
> Hi,
>
> I am writing a launcher to make a Windows application portable, 
> but since this application supports both x86 and x86_64, I 
> would like to detect the architecture of the OS my launcher is 
> being run on, in order to launch the proper executable.
>
> How can I do this?
>
> Regards, Hugo

http://stackoverflow.com/questions/601089/detect-whether-current-windows-version-is-32-bit-or-64-bit

http://support.microsoft.com/kb/556009


To detect environment variables you can use 
std.process.environment.get