On a Windows Vista-based computer, the BeforeNavigate2 event is not triggered as expected when you move to a non-standard link

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Consider the following scenario. You develop an application that hosts the WebBrowser control. Then, you move to a link in the WebBrowser control. In this scenario, you expect the BeforeNavigate2 event to be triggered before the target page is loaded. However, when you run this application on a Windows Vista-based computer, the BeforeNavigate2 event is not triggered when you move to a non-standard link.

Note A non-standard link refers to a link that has special characters and whose URL does not start with http, with https, with ftp, or with other known protocols.

For example, the HREF tag of the link in question is one of the following:
  • <a href="<ABCD>">
  • <a href= "abcd|ab12ab3l">
Therefore, the BeforeNavigate2 event cannot be used in the application.

Note This issue does not occur in Windows XP or in Windows Server 2003.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. 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 Web site: 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.


No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other previously released hotfixes.

Registry information

To use this hotfix, you do not have to make any changes to the registry.

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.
Windows Vista, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Update.mumNot Applicable1,94608-Oct-200716:29Not Applicable
X86_e23e78d70b5bb8d12cee8d2bd2b2718f_31bf3856ad364e35_6.0.6000.20695_none_fc3f0cbffeed4917.manifestNot Applicable69508-Oct-200716:29Not Applicable
X86_microsoft-windows-ieframe_31bf3856ad364e35_6.0.6000.20695_none_62e97b04ca5a9527.manifestNot Applicable829,50308-Oct-200716:29Not Applicable
To work around this problem, append the "http://" prefix to the beginning of the URL of the non-standard link in the HREF tag.

For example, change the <a href="<ABCD>"> tag to the following:
<a href="http://<ABCD>">
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.
More information
For more information about the BeforeNavigate2 event, visit the following Microsoft Web site:For more information about the WebBrowser control, visit the following Microsoft Web site: For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 943112 - Last Review: 01/16/2015 10:08:25 - Revision: 4.0

Windows Vista Enterprise 64-bit Edition, Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition, Windows Vista Business, Windows Vista Business 64-bit Edition, Windows Vista Enterprise, Windows Vista Home Premium, Windows Vista Ultimate

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