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\->Introduction->64 & 32 Bit Windows Operating System

64 & 32 Bit Windows Operating System

The "PROCESSOR_ARCHITECTURE" environment variable will tell you what mode your program/script is running under.

Sometimes on a 64 bit machine you may need to be sure to execute either under 32 bit or 64 bit mode. On a 64 bit OS the files at "%SystemRoot%\System32" are 64 bit images (although they seem to be able to run in 32 bit mode) and the ones at "%SYSTEMROOT%\SysWOW64" are 32 bit.

You can also see "SysWOW64" in the registry and that also represents 32 bit registry vs 64 bit registry values.

Also see the "ProgramFiles" & "ProgramFiles(x86)" environment variables.

Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.Please email me any feedback, additional information or corrections.
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Sunday September 07 2014 at 12:50pm
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Microsoft awarded me an MVP (Most Valuable Professional award) in 2004, 2005, 2006, 2007, 2008 & 2009 for the Windows SDK (Windows Installer) area.