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64-bit or 32-bit os version

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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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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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. :)