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How do I tell if I am using a 32 bit or 64 bit version of IE?

Symptoms

 I have been asked, by Tracker Software Support, if I am using a 32 bit or 64 bit version of Internet Explorer (IE), but I don't know.  How can I find out?

Cause

 Microsoft Windows 64 bit Operating Systems ship with 2 versions of Internet Explorer, 32 and 64 bit.

Resolution

 Simply go to the Help --> About Internet Explorer, window and look for "64-bit Edition"  If it is absent you are running the 32 bit version of IE.

32-bit Internet Explorer
32 bit about IE 
64-bit Internet Explorer

64 bit IE About Window

Later Versions

In later versions of Internet Explorer (10 + 11), Microsoft changed the way that this works. If you have a 32-bit installation of Windows, then you will be using 32-bit Internet Explorer,

If, however, you have a 64-bit installation of Windows, then it gets a little more complicated. As you can see from the screen-shots below, when first installed, Windows comes with Internet Explorer built in and, also by default, will install both the 32-bit and 64-bit application:

Ordinarily, Internet Explorer starts the 64-bit process, but sometimes Starts the 32-bit Process if the tabs/windows you open require it.

As you can see here, There is one 64-bit process, which is the main "frame":

and 2 of the tabs are 32-bit:

 By downloading Process Explorer, then searching for Internet Explorer. You can tell whether or not the processes are 32-bit

A 32-bit application will run from within Program Files (x86 [32-bit]). 

You can also right click the process and hit "Properties" in Process Explorer, then look for the image type, this method is more concrete:

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