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Asked: 2026-05-20T03:24:12+00:00

Hey there, I just wondered if there is a method to detect if the

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Hey there,
I just wondered if there is a method to detect if the 64bit or 32bit Version of IE8 is running?

Because there are some major Bugs in the Facebook Javascript SDK which only occure in IE8x64…

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  1. Editorial Team

    According to this IEBlog post you should be able to read it from the browsers User-Agent string via navigator.userAgent:

    Detecting 64-bit Internet Explorer

    As machines with more than 4 gigabytes of RAM become more common, more and more users are running 64-bit versions of Windows. For compatibility with 3rd party add-ons, the 32-bit edition of Internet Explorer remains the default on 64-bit systems. However, in some cases it can be useful for websites to recognize when users are visiting using 64-bit systems—for instance, a site may want to know whether to offer a 64-bit executable download.

    Tokens in the User-Agent string will enable you to determine whether or not the user is running a 64-bit version of Windows, and whether they are running the 64-bit edition of Internet Explorer.

    64-bit IE on 64-bit Windows:

    Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Win64; x64; Trident/4.0)

    32-bit IE on 64-bit Windows:

    Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0)

    Incidentally, WOW64 stands for “Windows on Windows 64-bit.”

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