how does win 7 distinguish between 64 and 32 bit software does it call a switch mode command or use the source in PROGRAM FILE

mikec1234

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Oct 19, 2014
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[s the mechanism to use 32bit instructions come by calling 32bit mode command or from being called from the PROGRAM FILES X86 folder or another way.
I am trying to get a large body of software to run on a 64bit machine.