There is only one file type that uses the .OR4 extension:
IBM Lotus Organizer 97 GS File
Organizer file created with Lotus Organizer, a personal information manager (PIM) software program; includes a contact list, calendar, to-do list, call record, and other information.
Lotus Organizer 97 GS was included as part of IBM Lotus SmartSuite 97 GS.
|IBM Lotus Organizer 97 GS or later|
Updated: March 24, 2009