Paulo Morgado

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Internet Explorer 10 User Agent Strings On Windows 8 64bit

Internet Explorer 10 is the web browser Microsoft is delivering with Windows 8.

According to its different usages and modes, its user agent string is as follows:

Application Environment 32/64 bit User Agent String
Internet Explorer Metro - Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)
Javascript Application Metro - Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0;)
C#/VB Application Metro 32bit Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
C#/VB Application Metro 64bit Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)
Internet Explorer Desktop 32bit
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
Internet Explorer Desktop 64bit(1) Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)
WPF Application Desktop 32bit Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; WOW64; Trident/6.0; .NET4.0E; .NET4.0C; Tablet PC 2.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Zune 4.7; InfoPath.3)
WPF Application Desktop 64bit Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; Win64; x64; Trident/6.0; .NET4.0E; .NET4.0C; Tablet PC 2.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Zune 4.7; InfoPath.3)
(1) Needs to be enabled for each security zone.

Analyzing the above table I conclude that:

  1. Metro Internet Explorer is always a 64bit application on 64bit Windows 8.
  2. Javascript Metro Style Applications don’t announce if they are 32bit or 64bit.
    1. They look like they are running on a 32bit Windows 8.
  3. Desktop Internet Explorer retains the same behavior introduced with Internet Explorer 8.
  4. Metro Style C#/VB Applications hosting the web browser (WebView control) exhibit the same behavior as Internet Explorer.
  5. Desktop WPF Applications hosting the web browser (WebBrowser control) retain the same behavior introduced with Internet Explorer 8.

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