| Extension |
Meaning / Link |
| .O |
Object File
(various) |
| .O$$ |
Output File
(temporary) |
| .O01 |
Typhoon Voice File |
| .OAB |
MS
Outlook Address Book |
| .OAZ |
OAZ Fax File |
| .OBD |
MS
Office Binder |
| .OBJ |
Relocatable Object
Code (various), Lightwave Object |
| .OBZ |
MS
Office Binder Wizard |
| .OCA |
Control Typelib
Cache |
| .OCX |
Object Linking and
Embedding (OLE) Control Extension |
| .OD1 |
Omnis5 Database File
(also .OD2, .OD3, etc.) |
| .ODE |
MS
Office Object Data Embedding File |
| .ODF |
Open Document
Interchange, BattleZone Cartographers Guild File |
| .ODL |
Visual
C++ Type Library Source |
| .ODS |
MS
Outlook Express Mailbox |
| .OFC |
Open Financial
Connectivity File |
| .OFF |
Vector Graphic
(Object File Format), 3D Mesh Object File Format |
| .OFM |
Adobe
Font |
| .OFN |
MS
Office FileNew File |
| .OFT |
MS
Outlook Item Template |
| .OFX |
Open Financial
Exchange File |
| .OKT |
Oktalyzer Tracker
Module |
| .OLB |
Object Library |
| .OLD |
Old Version
(sometimes used as a backup indicator) |
| .OLE |
Object Linking and
Embedding (OLE) Object |
| .OLI |
Olivetti Text File |
| .OMF |
Image File |
| .OND |
Lotus
Notes-related File |
| .ONX |
Onyx Graphics
Postershop File |
| .OPC |
Beta 44 Job File |
| .OPJ |
OrCad
Project File |
| .OPL |
Psion Organiser
Programming Language Source File |
| .OPO |
OPL Output
Executable File |
| .OPT |
QEMM
Optimize, Options, MS
Developer Studio File |
| .OPX |
MS Orgchart
Organization Diagram, OPL Extension DLL |
| .OQY |
MS
Excel OLAP Query File |
| .OR2 |
Lotus
Organiser 2 File |
| .OR3 |
Lotus
Organiser 97 File |
| .ORA |
Oracle
7 Configuration |
| .ORC |
MIDI File, Oracle
7 Script |
| .ORG |
Lotus
Organiser File |
| .ORI |
Original |
| .OSS |
MS
Office Saved Search |
| .OST |
MS Exchange/Outlook
Offline File |
| .OTL |
Super NoteTab
Template File |
| .OUT |
Outlines or Output
File (various) |
| .OV1 |
Program File -
Overlay |
| .OV2 |
Program File -
Overlay |
| .OV3 |
Program File -
Overlay |
| .OVL |
Program File -
Overlay |
| .OVR |
Program File -
Overlay |
| .OZM |
Sharp Organizer Memo
Bank |
| .OZP |
Sharp Organizer
Telephone Bank |
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