Screensaver run by the After Dark program; stores animations that are displayed on the screen when the system is inactive for a certain amount of time; popular After Dark screensavers include Flying Toasters and Bad Dog.
Program(s) that open ad files
Mac: Berkeley Systems After Dark X (ADX) Windows: Berkeley Systems After Dark
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/ad
