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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