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64-bit or 32-bit os version

Posted on 2007-07-22
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Last Modified: 2013-11-26
This should be an easy one, I hope! ;)

I'm creating an application in VB.NET and need to figure out if the operating system I'm running my app on is 64-bit or 32-bit. Does anyone know how to programatically figure this out?

I thought "System.Environment.OSVersion.Platform.ToString" would work but on my Vista 64-bit this returns "Win32NT". :(
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Question by:Krazz
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by:lorelogic
lorelogic earned 1500 total points
ID: 19544487
Try using the System.Environment.GetEnvironmentVariable() Method, for example:

String OSTest = Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE");
           
will return "X86" for 32 bit and will return "X64" for 64 bit.
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by:Krazz
ID: 19545783
Well, hmmmm. Are you sure? On my ssystem it returns AMD64 and I'm running Intel Core 2 Duo.

I'm also very sceptical due to the fact that it is called PROCESSOR_ARCHITECTURE which really has nothing to do with the operating system.

If I am wrong in my assuptions I apologize.
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lorelogic earned 1500 total points
ID: 19548585
Here is a link to a Microsoft Knowledgebase article to determine if the OS is 32 bit or 64 bit:
http://support.microsoft.com/kb/827218

This link also shows how to use the PROCESSOR_ARCHITECTURE envirionment variable to determine Process bitness:
http://blogs.msdn.com/david.wang/archive/2006/03/26/HOWTO-Detect-Process-Bitness.aspx

Note that the processor architecture EM64T, ia64 or AMD64 indicates a 64 bit OS. Itanium based processors are indicated with ia64 and x64 based processors are indicated with AMD64, since AMD created the original 64 bit design (even for Intel).
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by:Krazz
ID: 19549708
Thank you. Due to the fact that I have way too much in my head right now I thought two different users answered my question and I split the points up. Only after I realized you were the one posting both answers.

Either way, thank you very much for your help. This did solve my problem. :)
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