Microsoft Knowledge Base Article 894608 contains the following introduction:
The new Filter Manager feature improves the implementation and the deployment of file system filters. Filter Manager is available in the following products:
• Update Rollup 1 for Microsoft Windows 2000 Service Pack 4
• Microsoft Windows XP Service Pack 2
• Microsoft Windows Server 2003 Service Pack 1
You can obtain this feature immediately by following the instructions in the "More Information" section of this article.