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
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.
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: