Category Information
During registration, the CLSID of each plug-in is placed beneath one of the following keys in the HKEY_LOCAL_MACHINE\Software\Microsoft\ section of the registry, depending on the plug-in type:
Windows Media\Server\ RegisteredPlugins\Authentication
Windows Media\Server\ RegisteredPlugins\Broadcast Data Sink
Windows Media\Server\ RegisteredPlugins\Cache Proxy
Windows Media\Server\ RegisteredPlugins\Control Protocol
Windows Media\Server\ RegisteredPlugins\Data Protocol
Windows Media\Server\ RegisteredPlugins\Data Source
Windows Media\Server\ RegisteredPlugins\Event Notification and Authorization
Windows Media\Server\ RegisteredPlugins\Feedback Protocol
Windows Media\Server\ RegisteredPlugins\Media Parser
Windows Media\Server\ RegisteredPlugins\Network Source
Windows Media\Server\ RegisteredPlugins\Playlist Parser
Windows Media\Server\ RegisteredPlugins\Unicast Data Sink
The data protocol, feedback protocol, and network source subkeys contain the CLSIDs of hidden plug-ins.