File Extension Types that start with 'O'
OCX - Object Linking and Embedding (OLE) Control Extension also known as ActiveX controlODS - Outlook Express 5 Mailbox / OpenDocument Spreadsheet
ODT - OpenOffice and StarOffice OpenDocument Text Document
OFX - Open Financial Exchange
OGG - Ogg Vorbis Codec Compressed Multimedia
ORIG - A file that has been renamed to indicate that it is an original file.
O - Free Pascal Object FIle for Linux or DOS Version
O - Object
O - Origin C Compiled Program
O - UNIX / GCC Object
O - Unknown Apple II
O - Xcode Compiled Core C or Assembler Program
O$$ - Output
O$$ - Sprint Outfile
O01 - Typhoon Voice
O1 - Free Pascal Object File for GO321v1 Platform
O1 - Unknown Apple II
O2C - Objects to See 3D File Format
O3 - Ozone Messenger Program Support Files
O8O - Mediator5 Repositorytabs Vorlagen.006
OAB - Outlook Address Book
OAF - ETH Oberon Applet
OAF - Flight Simulator Texture
OAF - Outrage Animation Rows
OAH2DSK - Unknown Apple II
OAZ - NetFax Manager OAZ Fax
OB - ABF Outlook Backup Backup
OB - IMB LinkWay Object
OB! - Orbit Downloader Incomplete Download
OB$ - Compressed OBJ
OB1 - OzWin CompuServe E - mail / Forum Access Saved Outbox
OBA - Timespace X100 Digital Video Recorder Video
OBD - Office Binder Document
OBD - Oracle Forms Online Help
OBE - Out Of Box Experience
OBE - System DLL Oobe
OBJ - Hyperion - CADRazor 3D Model
OBJ - LightWave 3D Object
OBJ - Metatools Object Bryce Support
OBJ - Relocatable Object Code
OBJ - Wavefront 3D Object
OBJ0 - Unknown Apple II
OBJ1 - Unknown Apple II
OBJECTS - Unknown Apple II
OBK - Oxygen Phone Manager Phone Book
OBK - Ubi Soft Chessmaster Opening Book
OBN - Oberon - 2 Module Source
OBP - Bryce 5 Object Preset
OBPACK - ObjectBar Object Package
OBR - C++ Object Browser Data
OBR - Objective Reference Document Link
OBS - ObjectScript Script
OBS - OzWin CompuServe E - mail / Forum Access Saved Outbox
OBSKIN - ObjectBar Skin
OBT - Office Binder Template
OBTHEME - ObjectBar Theme
OBV - ObjectScript Visual Interface
OBX - Rational XDE
OBZ - Office Binder Wizard
OC_ - Doko Compressed Install
OC8 - OrgCon 8 Organization
OC9 - OrgCon 9 Organization
OCA - Control Typelib Cache
OCA - OLE Custom Control Library Information
OCA - Visual Basic Control Typelib Cache
OCB - Origin Precompiled Origin C
OCC - DB / TextWorks Database Terms and Words
OCC - OptControlCentre Model
OCCSAN - Unknown Apple II
OCD - OCAD Digitized Map
OCD - OrgCon 7 Organization
OCE - Brio Query
OCEN - EdGCM Data
OCF - Object Craft
OCF - OM2Cipher
OCM - AOL Advertising Control
OCM - Internet Odyssey 2 Update
OCM - Netscape Communicator Aim
OCP - Advanced Art Studio
OCP - Offline Commander Project
OCR - FAXGrapper FAX Text
OCS - eDoc DigiSign Digitally Signed Document
OCT - Octalizer Musical
OCT - Radiance Octree Format
OCTOPUSFONT - Unknown Apple II
OD1 - Omnis5 Database
OD2 - Omnis5 Database
OD3 - Omnis5 Database
OD4 - Omnis5 Database
OD5 - Omnis5 Database
OD6 - Omnis5 Database
OD7 - Omnis5 Database
OD8 - Omnis5 Database
OD9 - Omnis5 Database
ODA - AIBO Audio Voice
ODA - CALS Group IV Type 2 Raster Image
ODA - ODA Document
ODA - Used with OCX
ODB - ABAQUS
ODB - ArcView Object Database ASCII
ODB - OpenOffice / StarOffice OpenDocument (Ver 2) Database
ODB - Organizers Database (ODB) Database
ODB - Psion Organiser Datafile and LZ Diary
ODC - Office Data Connection
ODC - OpenOffice / StarOffice OpenDocument (Ver 2) Chart
ODCCUBEFILE - Office Data Connection
ODCDATABASEFILE - Office Data Connection
ODCNEWFILE - Office Data Connection
ODCTABLEFILE - Office Data Connection
ODDS - Unknown Apple II
ODE - Office Object Data Embedding
ODF - BattleZone Cartographers Guild
ODF - OnkoS Data
ODF - Open Document Interchange (ODIF)
ODF - OpenOffice / StarOffice OpenDocument (Ver 2) Formula
ODF - Star Trek Armada Ship / Structure Infomation
ODG - OpenOffice / StarOffice OpenDocument (Ver 2) Graphics Document
ODH - Odigo History
ODI - OpenOffice / StarOffice OpenDocument (Ver 2) Image
ODIF - Open Document Interchange Format
ODL - Object Definition Language
ODL - Visual C++ Type Library Source (Interface Definition Language File)
ODM - Opendisc Software
ODM - OpenOffice / StarOffice OpenDocument (Ver 2) Global Text Document
ODP - Analytics Parameters for Analysis Services
ODP - Oedipus
ODP - OpenOffice / StarOffice OpenDocument (Ver 2) Presentation
ODU - Odigo User
ODZ - IBM OpenDoc Editor Package
OEB - Open eBook Document
OEB - Outlook Express Backup Wizard
OEM - OEM Data Used During Device Install
OEM - SB_AWE Keys SB_NT
OEM - Text Listing of Supported OEM Devices for WinNT
OF - Audio Utility Tuningwrench Compressed
OF - LessDATA Video System OneFile
OF - MicroImages Outline Font
OFASTER - Unknown Apple II
OFC - Open Financial Connectivity
OFD - 20 - 20 Office Sales E-magine
OFD - ObjectView Form Defintion
OFD - OfficeForms Form Data
OFF - 3D Mesh Object File Format
OFF - Unknown Apple II
OFF - Vector Graphic
OFFENSE - Unknown Apple II
OFFICES - Unknown Apple II
OFM - Embroidery Design
OFM - Font
OFM - OfficeForms Blank Form
OFM - OmniForm Form
OFM - PostScript Font Description
OFN - Office FileNew
OFN - Systems Management Server (SMS) Offer Creation Notification
OFR - OptimFROG Encoded Audio
OFR - Systems Management Server (SMS) Offer Description
OFT - Outlook Item Template
OFW - Toplevel Forms Form
OGF - OnkoS Graphic
OGF - Outrage Graphic Rows
OGI - OpenPBX Gateway Interface
OGL - Overlay Source Code
OGM - Ogg Vorbis Compressed Video
OGM - Origin Matrix
OGNC - Web Page Source Code
OGO - OriginPro Graphic Object
OGS - Origin Script
OGW - Origin Worksheet
OGX - C++ Component Gallery Exported Classes and Resources
OH - Overhoor ( DrillAssistant) List
OH4 - Overhoor ( DrillAssistant) List
OHC - OpenHelp Table of Contents
OHI - OpenHelp Index
OHL - OpenHelp Link
OHP - DOS 7
OHP - OpenHelp Project
OHS - Bink Outbound History
OHSD - HealthFrame OpenHealth Service Plug - in
OHW - Overhoor ( DrillAssistant) List
OID - Prosa / OM Object Interaction Diagram
OIF - QuickBase Web - sharable Database Interchange
OIL - Open Image Library Format
OIT - SleepScan and Ceegraph Offset Index
OJP - 3WayPack
OK - Dot OK File Digest
OK - Unknown Apple II
OKS - OKScript
OKT - Oktalyzer Tracker Module
OKX - OKScript
OLB - AUTOGEN
OLB - Automation Object Library
OLB - Medical Terminology Challenge Data
OLB - PSpice Capture Symbols Models
OLB - VAX Object Library
OLD - Old Version
OLD - Unknown Apple II
OLDEST - Unknown Apple II
OLE - Object Linking and Embedding (OLE) Object
OLF - OyezForms Legal Documents (UK)
OLI - Olivetti Text
OLK - MS Mail Mailbag Lock
OLK - Outlook Address Book
OLL - TrialDirector Object Load List
OLLIEFONT - Unknown Apple II
OLN - Visual C++ Outline Examples
OLR - Openlab Raw Format
OLRW - Openlab Raw Format
OLT - Orbit Downloader List
OLT - Visual C++ Outline Examples
OLV - OnLive! Traveler Sound
OLV - OyezForms Legal Documents (UK)
OM - Omicron Compiler
OMA - Sony OpenMG Music Format
OMD - Prosa / OM Class Model
OMF - Open Media Format
OMF - Operation, Management & Finance Database
OMG - O&O DiskImage Disk Image
OMG - OpenMG Jukebox
OMN - Omnipotent, Inc. Collection
OMO - Oracle Media Objects
OMS - Briggs Softworks Order Maven
OMS - Macintosh MP3 Music Format
OMS - Omega Downloader Configuration
OMX - OMAX Make Tool Path
OMX - Ots Media Library
ON - Audio Utility Tuningwrench Compressed
ON - Unknown Apple II
OND - Notes Database
ONE - docPointer Visual ReadMe
ONE - EdgeCAM Licensing Data Ffile
ONE - OneNote Note
ONE - SEMONE Compressed Archive
ONE - Unknown Apple II
ONF - Open Navigation Format
ONLINE - Unknown Apple II
ONX - Onyx Graphics Postershop
OO - Free Pascal Object File for OS / 2 Version
OOM - Shroom Swap
OOP - OOP Packer Archive
OP - Origin Preprocessed Origin C
OP - Rescue Disk
OP2 - Musplay 1.72
OP2 - Outpost 2 Saved Game
OP2 - Stanford Research Systems Optimlelt
OP73 - Unknown Apple II
OPA - Psion OPL Object
OPC - Beta 44 Job
OPC - Office Upgrade Control
OPC - Omron OPC Client
OPD - Durango Interferometry Software Document
OPD - OmniPage Document
OPEN - Unknown Apple II
OPENYOURMIND - Unknown Apple II
OPF - Flip Album
OPF - Gemstar eBook Publisher Package
OPF - KEPServerEX Project Configuration
OPF - Obsidium Project
OPF - Visual OMP Project
OPI - OmniPass Exported User
OPJ - OmniPage Schedule
OPJ - OrCAD Project
OPJ - Origin Project
OPK - Origin Origin Pack
OPL - Psion Organiser Programming Language Source
OPM - Quadrox Digital CCTV System Components
OPML - Outline Processor Markup Language
OPN - Court Opinion
OPN - Exact Active Options
OPN - Rebel Strip Poker Opponent
OPN - Strip Poker Deluxe Opponent
OPO - Psion OPL Output Executable
OPO - Psion Organiser OPL Code
OPOS - VirtuaSys Opos Script
OPP - IPhoto
OPS - Dynamite VSP Object Placement Style
OPS - Office Profile Settings
OPT - Business Integrator Option
OPT - Delphi Project Options
OPT - Developer Studio File Workspace Options
OPT - FLEXnet Manager Options
OPT - Options / Configuration
OPT - pcAnywhere Option Set
OPT - ProWORX Nxt List Module Option
OPT - Psion Organiser OPL Source
OPT - QEMM Optimize
OPT - Segue SilkTest Option Set
OPT - Unknown Apple II
OPTIONAL - Unknown Apple II
OPTNS - Unknown Apple II
OPUS - Unknown Apple II
OPW - OrgPlus Organization Chart
OQY - Excel OLAP Query
OR - Unknown Apple II
OR2 - Organizer Ver 2
OR3 - Organizer 97
OR4 - Organizer
OR5 - Organizer
OR6 - Organizer Data
OR8 - Rational Rose Oracle8 Database Model Report
ORA - Oracle 7 Configuration
ORCA - Unknown Apple II
ORD - BC45 Owl
ORD - OMAX Make Tool Path
ORE - 3WayPack
ORF - Descent 3 Outrage Room Format
ORF - Olympus Digital Camera Raw Image
ORG - Hollywood FX Effects Organizer
ORG - Microcal Origin Plot
ORG - Netmino
ORG - Odds Ratio Generator Data
ORG - Organiser
ORG - Origin
ORG - Unknown Apple II
ORG - Yamaha Organ Flutes
ORGAN - Unknown Apple II
ORI - Need for Speed - Hot Pursuit 2
ORI - Original
ORIGINAL - Netobjects Fusion Components BBScomp Message
ORO - 3WayPack
ORV - Oracom Video Format
OS - Unknown Apple II
OS2 - Unknown Apple II
OS3 - OS / 2 Warp 3
OSA - W32 / Sober - AD
OSC - Formula One 2001 Options
OSC - Fruitypro Samples SS_effects
OSC - OptionScope Worksheet
OSC - Remote Installation Services Client Installation Wizard
OSD - Open Software Description
OSD - SoftGrid Program Description
OSF - Descent 3 Sound
OSF - Distribution Bin
OSF - ICZ OriSAFE
OSF - Opera Skin
OSG - OpenSceneGraph ASCII Native Format
OSI - Osiris Database
OSI - SunNet OSI Description
OSL - OckamSoft Log
OSMALLER - Unknown Apple II
OSS - Office Saved Search
OST - Exchange Offline
OST - Outlook Offline Storage
OST - Tivoli Storage Manager
OSTANDARD - Unknown Apple II
OTB - Nokia Phone Graphics Editor
OTB - On - the-air Bitmap
OTC - OpenOffice / StarOffice OpenDocument (Ver 2) Chart Template
OTF - Blu - ray Text Subtitle Font Information
OTF - OnkoS Text Data
OTF - Open Type Font Format
OTF - OpenOffice / StarOffice OpenDocument (Ver 2) Formula Template
OTG - OpenOffice / StarOffice OpenDocument (Ver 2) Graphics Document Template
OTH - OpenOffice / StarOffice OpenDocument (Ver 2) HTML Text Template
OTH - Origin Graph Properties
OTH - Power Toys Other Folder Explorer Tool
OTHERFOLDER - Power Toys Other Folder Explorer Tool
OTHERS - Unknown Apple II
OTI - OpenOffice / StarOffice OpenDocument (Ver 2) Image Template
OTL - Fookes Super NoteTab Template
OTL - NoteTab Outline
OTL - OpenTrap Event Log
OTL - Ventura Publisher's Type Foundry Outline Editor format
OTL - Z - Soft Type Foundry Font
OTM - Micro Cookbook
OTM - Origin Matrix Template
OTM - Outlook VBA Module
OTM - Unknown Apple II
OTM2 - Unknown Apple II
OTN - OmniPage Training
OTP - OpenOffice / StarOffice OpenDocument (Ver 2) Presentation Template
OTP - Origin Graphic Template
OTP - Top Secret Crypto Gold One Time Pad Key
OTRKEY - OnlineTvRecorder Encoded Video
OTS - OpenOffice / StarOffice OpenDocument (Ver 2) Spreadsheet Template
OTS - OtsJuke Sound
OTS - PSR - 9000
OTT - Nokia Phone Ring Tone
OTT - OpenOffice / StarOffice OpenDocument (Ver 2) Text Document Template
OTW - Origin Worksheet Template
OTX - Olivetti Olitext Plus
OU! - OzWin CompuServe E - mail / Forum Access Outbound Messages Online
OUT - 3WayPack
OUT - MyInfo Documnet / Outline
OUT - NovaBACKUP Backup Set
OUT - Outlines or Output
OUT - OzWin CompuServe E - mail / Forum Access Outbound Messages
OUT - Pro / ENGINEER Temporary
OUT - Unknown Apple II
OUTPUT - Unknown Apple II
OV - OpenInsight Database Overflow
OV - OrgPlus OrgViewer
OV1 - Program File - Overlay
OV2 - Program File - Overlay
OV2 - TomTom Point of Interest
OV3 - Program File - Overlay
OVA - Sierra Web Studio Graphic
OVA - Web Studio Project Page
OVB - OnkoS Vocabulary Backup
OVD - ObjectVision Datafile (Application)
OVE - Cakewalk Overture Score
OVER - Unknown Apple II
OVL - Program File - Overlay
OVL - RollerCoaster Tycoon Program Sprite
OVL - Unknown Apple II
OVM - BHV Tonstudio Platin
OVR - Program File - Overlay
OVW - Cool Edit Pro Overview
OVW - Cubase .WAV File Image
OVW - DIANA Overview
OVX - Psion Oval Control
OW - Free Pascal Object File for Windows Version
OWD - OpenWire Project
OWF - OnkoS Wave Data
OWL - BC45 Owl
OWLING - Unknown Apple II
OWS - Web Studio Project
OX - Ox Object - Oriented Matrix Programming Language
OXB - OlapX Report Portfolio
OXC - OlapX Cube Definition
OXL - OMEGA Product Suite
OXO - DB - MAIN Compiled Voyager-2 Program
OXO - Ox Object - Oriented Matrix Programming Language
OXV - OlapX Local View
OYB - Organize Your Beanie Babies Data
OYZ - Lotus Approach Alternate dBASE Index
OZF - Mozart Programming System Functor
OZF2 - OziExplorer Map
OZFX3 - OziExplorer Image
OZM - Sharp Organizer Memo Bank
OZP - Sharp Organizer Telephone Bank
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