File Extension OR4 File Format Organizer (IBM) OR4 stands for Organizer (IBM). This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question ZOS support of CICS 4.1 and IMS 6 Best approach to determine CPU cores - physical and logical Are IBM SCSI drives custom?