There is only one file type that uses the .OR3 extension:
IBM Lotus Organizer 97 File
Data file created with Lotus Organizer 97 (a.k.a. Lotus Organizer 3) personal information manager software; contains a calendar, a list of contacts, a to-do list, notes, and other information.
Lotus Organizer 97 was included as part of IBM Lotus SmartSuite 97.
|IBM Lotus Organizer 97 or later|
Updated: December 8, 2009