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Does anyone know how I can find this information? System properties does not specify the version, winver does not specify this either.

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Go to Control Panel > System and Maintenance > System

And Look at the 4th row under system

Check windows architecture

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You can see this in the system control panel applet - I see an entry "system type" there which mentions "32-bit Operating System"

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In Vista and later it's more easily visible. It may be that 64-bit XP also shows it. At least 64-bit Server 2k3 does. – Joey Oct 15 '09 at 7:31

Some command-line ways to get to that information:

You can take a look at the PROCESSOR_ARCHITECTURE environment variable. This will be "x86" for a 32-bit OS and AMD64 for x86_64 (dunno the value for Itanium right now, but probably "IA64" or similar):

> echo %processor_architecture%

> echo %processor_architecture%

This even works with a 32-bit OS on a 64-bit-capable CPU.

Another way—though not in ancient versions of Windows—would be to use WMI:

> wmic os get OSArchitecture

> wmic os get OSArchitecture
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I found a link that successfully identifies the differences at Microsoft Support:

  • Click Start, type system in the Start Search box, and then click system in the Programs list.
  • The operating system is displayed as follows:
    • For a 64-bit version operating system: 64-bit Operating System appears for the System type under System.
    • For a 32-bit version operating system: 32-bit Operating System appears for the System type under System.
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@CaptainCasey +1 nice find – alex Oct 15 '09 at 6:36

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