After creating or obtaining custom plug-ins for use with your Windows Media server, you should protect those plug-ins from tampering by placing them in a protected directory. After a custom or third-party plug-in has been installed and registered, it could be overwritten or modified in ways that could render it ineffective or malicious to the server. Place the plug-ins in a directory that denies write permissions to unauthorized users. Ensure that Windows Media Services has read permissions to the directory that contains the plug-ins or they cannot be used.