There is only one file type that uses the .OR5 extension:
Lotus Organizer 5 File
Organizer file created with Lotus Organizer 5, personal information manager (PIM) software; contains multiple types of data, including a calendar, personal contacts, to-do lists, call records, and other information.
Lotus Organizer 5 was included as part of IBM Lotus SmartSuite 5, also known as Lotus SmartSuite Millennium Edition 9.5.
|IBM Lotus Organizer 5 or later|
Updated: November 20, 2009