How do I determine whether my Windows installation is 64 or 32 bit?

How do I determine whether my Windows installation is 64 or 32 bit? 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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bert [Entry]

"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%
AMD64

> echo %processor_architecture%
x86

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
OSArchitecture
64-bit

> wmic os get OSArchitecture
OSArchitecture
32-bit"