Periodically, a problem may occur with a given system setting, or some application, and the common remedy of removing a seemingly obvious preferences "plist" file may not reset the setting. In OS X, plist files are simply ways of storing editable application settings, and they can be preference files or numerous other files that are spread throughout the system. There is no easy way to find which plist file is responsible for holding a certain setting, or is involved with a given application.
