batch file to check 64bit or 32bit OS

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This is the correct way to perform the check as-per Microsoft’s knowledgebase reference ( http://support.microsoft.com/kb/556009 ) that I have re-edited into just a single line of code.

It doesn’t rely on any environment variables or folder names and instead checks directly in the registry.

As shown in a full batch file below it sets an environment variable OS equal to either 32BIT or 64BIT that you can use as desired.

@echo OFF

reg Query "HKLM\Hardware\Description\System\CentralProcessor\0" | find /i "x86" > NUL && set OS=32BIT || set OS=64BIT

if %OS%==32BIT echo This is a 32bit operating system
if %OS%==64BIT echo This is a 64bit operating system

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