The FilterState property indicates whether the installed filter is loaded or unloaded, as defined in the Bitmask Values table.
Because this property is internally configured by IIS, you should consider it to be read-only. Do not configure this property.
Client: Requires Windows XP Professional, Windows 2000 Professional, or Windows NT Workstation 4.0.
Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.