Article ID: 968235 - View products that this article applies to.
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After you create a file filter by using selected file types, Microsoft Forefront Security for SharePoint does not correctly detect MP3 files, and MP3 files are not filtered.
To resolve this problem, install Forefront Security for SharePoint Service Pack 3 (SP3). Forefront Security for SharePoint with SP3 has added functionality that can detect more MP3 file header types.
For more information, 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: 968235 - Last Review: January 15, 2015 - Revision: 1.0