For file association management, the flash.desktop.NativeApplication class in AIR provides 4 methods: isSetAsDefaultApplication(extension:String):Boolean returns whether the current AIR application is the default way to open the specified file format. The extension parameter is a file extension string — you don’t write the “.”, for example “flv”. The extension for the next 3 is the same. setAsDefaultApplication(extension:String):void associates the current application with a certain file format. removeAsDefaultApplication(extension:String):void removes the association between an AIR application and a file. getDefaultApplication(extension:String):String reports the path of the application associated with a certain file. Returns a string of the application path.