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A custom MIME filter is disabled and not invoked in Internet Explorer 9
Article ID: 2628551 - View products that this article applies to.
You have a custom MIME filter that meets the following conditions:
When you use this custom MIME filter in Windows Internet Explorer 9, you may notice that the MIME filter is disabled and is not invoked.
This issue occurs when the response that contains the MIME type is returned, and Internet Explorer cannot find a registered MIME filter for the MIME type.
Note If you use Windows Internet Explorer 8, the custom MIME filter is always invoked.
To resolve this problem, install this update. After you install this update, you must enable the hotfix.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756To enable the hotfix, follow these steps:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Security update informationTo resolve this issue, install the most recent cumulative security update for Internet Explorer. To do this, visit the following Microsoft website:
http://update.microsoft.comFor more technical information about the most recent cumulative security update for Internet Explorer, visit the following Microsoft website:
Note This update was first included in security update 2618444.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/2618444/ )MS11-099: Cumulative Security Update for Internet Explorer: December 13, 2011
To work around this issue, make sure that the MIME filter is always registered.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the MIME filter, visit the following Microsoft Developer Network (MSDN) website:
About Pluggable MIME FiltersFor more information about the WebBrowser control, visit the following MSDN website:
WebBrowser ControlFor more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates