A hotfix is available for the ASP.NET browser definition files in the Microsoft .NET Framework 4.0

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Article ID: 2600088 - View products that this article applies to.
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SUMMARY

This article describes a hotfix for the ASP.NET browser definition files that are included in the Microsoft .NET Framework 4.0.

MORE INFORMATION

This hotfix introduces updated definitions in the browser definition files for Internet Explorer and for Mozilla Firefox. The browser definition files are stored in one of the following folders, depending on the installed version of the Microsoft .NET Framework:
  • For 32-bit versions of the .NET Framework 4.0

    %WinDir%\Microsoft.NET\Framework\v4.0.30319\CONFIG\Browsers
  • For 64-bit versions of the .NET Framework 4.0

    %WinDir%\Microsoft.NET\Framework64\v4.0.30319\CONFIG\Browsers
By default, ASP.NET uses sniffing technology for the user agent string to detect browsers. The browser definition files cover a certain range of browser versions. However, as the version numbers increase, ASP.NET might not recognize new versions of a browser by using the user agent string. In this case, ASP.NET might handle these versions as an unknown browser. For example, ASP.NET cannot recognize Windows Internet Explorer 10 that has the following user agent string:

Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have the .NET Framework 4 installed.

Restart information

After you apply this hotfix, you might have to restart the computer if any affected files are being used when you install this hotfix.

To avoid a restart of the computer, shut down all web server applications for ASP.NET websites before you apply this hotfix.

Replacement information

This hotfix does not replace a previously-released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

For all supported x86-based versions of the .NET Framework 4.0
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Aspnet_wp.exe4.0.30319.50432,59222-Aug- 201106:03x86
Firefox.browserNot applicable3,08221-Aug-201122:10Not applicable
Ie.browserNot applicable4,28321-Aug-201122:10Not applicable
Setup.dll10.0.30319.504295,76022-Aug- 201106:03x86
Setupengine.dll10.0.30319.504809,30422-Aug- 201106:03x86
Setupui.exe10.0.30319.50478,15222-Aug- 201106:03x86
System.web.dll4.0.30319.5045,227,85622-Aug- 201106:03x86
System.web.extensions.dll4.0.30319.5041,862,50422-Aug- 201106:03x86
Webengine.dll4.0.30319.50414,16022-Aug- 201106:03x86
Webengine4.dll4.0.30319.504495,44022-Aug-201106:03x86
For all supported x64-based versions of the .NET Framework 4.0
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Aspnet_wp.exe4.0.30319.50440,78422-Aug- 201106:38x64
Firefox.browserNot applicable3,08221-Aug-201121:37Not applicable
Ie.browserNot applicable4,28321-Aug-201121:37Not applicable
Setup.dll10.0.30319.504295,76022-Aug- 201106:03x86
Setupengine.dll10.0.30319.504809,30422-Aug- 201106:03x86
Setupui.exe10.0.30319.50478,15222-Aug- 201106:03x86
System.web.dll4.0.30319.5045,197,13622-Aug- 201106:38x64
System.web.extensions.dll4.0.30319.5041,862,50422-Aug- 201106:03x86
Webengine.dll4.0.30319.50415,69622-Aug- 201106:38x64
Webengine4.dll4.0.30319.504720,72022-Aug-201106:38x64
For all supported IA-64based versions of the .NET Framework 4.0
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Aspnet_wp.exe4.0.30319.50480,20822-Aug- 201107:09IA-64
Firefox.browserNot applicable3,08221-Aug-201122:12Not applicable
Ie.browserNot applicable4,28321-Aug-201122:12Not applicable
Setup.dll10.0.30319.504295,76022-Aug- 201106:03x86
Setupengine.dll10.0.30319.504809,30422-Aug- 201106:03x86
Setupui.exe10.0.30319.50478,15222-Aug- 201106:03x86
System.web.dll4.0.30319.5044,816,20822-Aug-201107:09IA- 64
System.web.extensions.dll4.0.30319.5041,862,50422-Aug- 201106:03x86
Webengine.dll4.0.30319.50425,42422-Aug-201107:09IA- 64
Webengine4.dll4.0.30319.5041,340,75222-Aug-201107:09IA-64
Note Because of file dependencies, this hotfix might also contain other files.

Common issues that occur without this hotfix

Issue 1

Consider the following scenario:
  • You use Windows Internet Explorer 10 to access an ASP.NET-based webpage.
  • The webpage starts a postback.

In this scenario, the postback fails, and you receive the following error message:
Script Error encountered", "'__doPostBack' is undefined
Note The webpage can start a postback in various ways. For example, a LinkButton control can start a postback.

Issue 2

Consider the following scenario:
  • You create an ASP.NET-based webpage that has the MaintainScrollPositionOnPostBack attribute set to True.
  • You use Mozilla Firefox 4.0 or a later version of Mozilla Firefox to open the webpage.
  • The webpage starts a postback.

In this scenario, the scroll position of the webpage is not maintained after postback.

REFERENCES

For more information about the MaintainScrollPositionOnPostBack attribute, visit the following Microsoft website:
General information about the MaintainScrollPositionOnPostBack attribute
For more information about the browser definition file schema, visit the following Microsoft website:
General information about the browser definition file schema
For more information about the Internet Explorer 10 user agent string, visit the following Microsoft website:
General information about the Internet Explorer 10 user agent string
For more information about how to detect Internet Explorer more effectively, visit the following Microsoft website:
How to detect Internet Explorer more effectively

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Properties

Article ID: 2600088 - Last Review: September 2, 2011 - Revision: 1.0
APPLIES TO
  • Microsoft ASP.NET 4
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2600088

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