A warning message unexpectedly appears when you try to download a file in Internet Explorer 9: "This type of file could harm your computer"

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Article ID: 2566263 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario. You turn on the SmartScreen Filter in Windows Internet Explorer 9 and then try to download a file type that is supported by SmartScreen Application Reputation. In this scenario, the following warning message unexpectedly appears on the download notification bar in Internet Explorer 9:  
This type of file could harm your computer

CAUSE

The SmartScreen Application Reputation service checks the reputation of a file. Therefore, you should not see the generic "This type of file could harm your computer" warning message when you try to download a file type is supported by SmartScreen Application Reputation. This issue occurs because the file name extension in the URL differs from the actual file name extension. (The actual file name extension is specified by the "content-disposition: attachment" HTML header.) Because of the different file name extensions, the warning message is displayed incorrectly.

RESOLUTION

Security update information

To resolve this problem, install the most recent cumulative security update for Windows Internet Explorer. To do this, visit the following Microsoft website:
http://update.microsoft.com
 For more technical information about the most recent cumulative security update for Internet Explorer, visit the following Microsoft website:
http://www.microsoft.com/technet/security/current.aspx
Note This update was first included in security update 2530548 (MS11-050). For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2530548  MS11-050: Cumulative security update for Internet Explorer: June 14, 2011

MORE INFORMATION

For more information about the SmartScreen Application Reputation service, visit the following Microsoft websites:
SmartScreen Application Reputation

Introducing SmartScreen Application Reputation

Properties

Article ID: 2566263 - Last Review: June 24, 2011 - Revision: 2.0
APPLIES TO
  • Windows Internet Explorer 9
Keywords: 
kbqfe kbhotfixserver kbfix kbprb kbsurveynew KB2566263

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