Detect 64-bit or 32-bit Windows from User Agent or Javascript?

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Try this, looks for WOW64 (32-bit on 64-bit) or Win64 (native 64-bit) in the user-agent string. 

    if (navigator.userAgent.indexOf("WOW64") != -1 || 
        navigator.userAgent.indexOf("Win64") != -1 ){
       alert("This is a 64 bit OS");
    } else {
       alert("Not a 64 bit OS");
    }

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