pass method object method equip handl document event finder document regist finder cf bundl document type dictionari applic bundl info plist param target object contain method param file handler method invok open file set file handler object target method file handler set handler osx adapt handl open file target file handler overrid osx adapt target send inform file open target object appl event appl event method filenam method appl event declar method filenam filenam filenam method invok appl event object target method invok target object object filenam except ex 