Article ID: 968267 - View products that this article applies to.
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If you have a *.* file filter that includes the .rar file type, Microsoft Forefront Security for SharePoint may falsely detect an attachment as an .rar file when it is not an .rar file.
To resolve this issue, install Forefront Security for SharePoint Service Pack 3 (SP3). For more information about Forefront Security for SharePoint SP3, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/967995/ )Description of Forefront Security for SharePoint with Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 968267 - Last Review: January 15, 2015 - Revision: 1.0