While there are a lot of ways to detect for a 64 bit version of windows. you can test for %programFiles(x86)%, but handling the output and writing the IF comparisons is messy.

In Batch files, you can easily check for architecture by using the “processor_architecture” variable. x86 versions of windows will have this set to “x86″, and x64 versions “x64″. Heres an easy example:

@echo off
IF %processor_architecture% == AMD64 echo This is a 64-bit version of windows
IF %processor_architecture% == x86 echo this is a 32-bit version of windows.
pause

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