O Object File

O Origin C Compiled Program File (OriginLab)

O Free Pascal Object FIle for Linux or DOS Version (FPC Development Team)

O UNIX/GCC Object File

O$$ Output File

O$$ Sprint Outfile

O01 Typhoon Voice File

O1 Free Pascal Object File for GO321v1 Platform (FPC Development Team)

O2C Objects to See 3D File Format (mb Software AG)

O3 Ozone Messenger Program Support Files (htmlland.net)

O8O Mediator5 Repositorytabs Vorlagen.006 File

OAB Outlook Address Book (Microsoft)

OAF Outrage Animation Rows

OAF Flight Simulator Texture File (Microsoft)

OAF ETH Oberon Applet File

OAZ NetFax Manager OAZ Fax File

OB IMB LinkWay Object File

OB ABF Outlook Backup Backup File (ABF software, Inc.)

OB$ Compressed OBJ (Microsoft)

OB1 OzWin CompuServe E-mail/Forum Access Saved Outbox File

OBA Timespace X100 Digital Video Recorder Video File (Electronics Services Agency)

OBD Office Binder Document (Microsoft)

OBD Oracle Forms Online Help File (Oracle)

OBE Out Of Box Experience

OBE System DLL Oobe File

OBJ Metatools Object Bryce Support File

OBJ Wavefront 3D Object

OBJ LightWave 3D Object (NewTek)

OBJ Relocatable Object Code

OBK Ubi Soft Chessmaster Opening Book File

OBK Oxygen Phone Manager Phone Book (Oxygen Software)

OBN Oberon-2 Module Source File

OBP Bryce 5 Object Preset (Corel Corporation)

OBPACK ObjectBar Object Package (Stardock Corporation, Inc.)

OBR Objective Reference Document Link (Objective Corporation Limited)

OBR C++ Object Browser Data File (Borland Software Corporation)

OBS OzWin CompuServe E-mail/Forum Access Saved Outbox File

OBS ObjectScript Script

OBSKIN ObjectBar Skin File (Stardock Corporation, Inc.)

OBT Office Binder Template (Microsoft)

OBTHEME ObjectBar Theme File

OBTHEME ObjectBar Theme File (Stardock Corporation, Inc.)

OBV ObjectScript Visual Interface

OBX Rational XDE (IBM)

OBZ Office Binder Wizard (Microsoft)

OCA OLE Custom Control Library Information

OCA Visual Basic Control Typelib Cache

OCA Control Typelib Cache (Microsoft)

OCB Origin Precompiled Origin C File (OriginLab Corporation)

OCC OptControlCentre Model File

OCC DB/TextWorks Database Terms and Words

OCD OCAD Digitized Map (Steinegger Software)

OCE Brio Query (Hyperion Solutions Corporation)

OCEN EdGCM Data File (The EdGCM Cooperative Project of Columbia University)

OCF Object Craft File

OCF OM2Cipher File

OCM Netscape Communicator Aim File

OCM AOL Advertising Control File (America Online, Inc.)

OCM Internet Odyssey 2 Update

OCP Offline Commander Project File

OCP Advanced Art Studio

OCR FAXGrapper FAX Text File

OCS eDoc DigiSign Digitally Signed Document (Fujitsu Denmark)

OCT Octalizer Musical File

OCT Radiance Octree Format

OCX Object Linking and Embedding (OLE) Control Extension (Microsoft)

OC_ Doko Compressed Install File

OD1 Omnis5 Database File

OD2 Omnis5 Database File

OD3 Omnis5 Database File

OD4 Omnis5 Database File

OD5 Omnis5 Database File

OD6 Omnis5 Database File

OD7 Omnis5 Database File

OD8 Omnis5 Database File

OD9 Omnis5 Database File

ODA Used with OCX

ODA ODA Document

ODA CALS Group IV Type 2 Raster Image

ODA AIBO Audio Voice (Sony)

ODB ABAQUS File (ABAQUS, Inc.)

ODB ArcView Object Database ASCII File (ESRI)

ODB Organizers Database (ODB) Database (Organizers' Collaborative)

ODB Psion Organiser Datafile and LZ Diary File (Psion PLC)

ODB OpenOffice/StarOffice OpenDocument (Ver 2) Database (Sun Microsystems, Inc.)

ODC Office Data Connection

ODC OpenOffice/StarOffice OpenDocument (Ver 2) Chart (Sun Microsystems, Inc.)

ODCCUBEFILE Office Data Connection

ODCDATABASEFILE Office Data Connection

ODCNEWFILE Office Data Connection

ODCTABLEFILE Office Data Connection

ODE Office Object Data Embedding File (Microsoft)

ODF Open Document Interchange (ODIF)

ODF BattleZone Cartographers Guild File

ODF OnkoS Data (OnkoS)

ODF Star Trek Armada Ship/Structure Infomation

ODF OpenOffice/StarOffice OpenDocument (Ver 2) Formula (Sun Microsystems, Inc.)

ODG OpenOffice/StarOffice OpenDocument (Ver 2) Graphics Document (Sun Microsystems, Inc.)

ODH Odigo History File (Comverse, Inc. a part of Comverse Technology)

ODI OpenOffice/StarOffice OpenDocument (Ver 2) Image (Sun Microsystems, Inc.)

ODIF Open Document Interchange Format

ODL Object Definition Language

ODL Visual C++ Type Library Source (Interface Definition Language File) (Microsoft)

ODM Opendisc Software (Opendisc)

ODM OpenOffice/StarOffice OpenDocument (Ver 2) Global Text Document (Sun Microsystems, Inc.)

ODP Oedipus

ODP OpenOffice/StarOffice OpenDocument (Ver 2) Presentation (Sun Microsystems, Inc.)

ODS OpenOffice/StarOffice OpenDocument (Ver 2) Spreadsheet (Sun Microsystems, Inc.)

ODS Outlook Express Mailbox (Microsoft)

ODS NCompass Labs Internet Script

ODT OpenOffice/StarOffice OpenDocument (Ver 2) Text Document (Sun Microsystems, Inc.)

ODT MindRender Virtual Reality Explorer Kit (VREK) Object File Format (Themekit Systems Ltd.)

ODU Odigo User File (Comverse, Inc. a part of Comverse Technology)

ODZ IBM OpenDoc Editor Package File

OEB Outlook Express Backup Wizard

OEM OEM Data Used During Device Install

OEM SB_AWE Keys SB_NT File

OEM Text Listing of Supported OEM Devices for WinNT

OF MicroImages Outline Font (MicroImages, Inc.)

OF Audio Utility Tuningwrench Compressed File

OF LessDATA Video System OneFile File

OFC Open Financial Connectivity File

OFD 20-20 Office Sales E-magine File (20-20 Technologies)

OFD OfficeForms Form Data File (Toplevel Computing)

OFD ObjectView Form Defintion

OFF Vector Graphic

OFF 3D Mesh Object File Format

OFM PostScript Font Description File

OFM OfficeForms Blank Form File (Toplevel Computing)

OFM OmniForm Form File

OFM Font (Adobe)

OFM Embroidery Design File

OFN Office FileNew File (Microsoft)

OFN Systems Management Server (SMS) Offer Creation Notification (Microsoft Corporation)

OFR OptimFROG Encoded Audio (Florin Ghido)

OFR Systems Management Server (SMS) Offer Description File (Microsoft Corporation)

OFT Outlook Item Template (Microsoft)

OFX Olicom Fax

OFX Open Financial Exchange File

OGF Outrage Graphic Rows

OGF OnkoS Graphic File (OnkoS)

OGG Salt Lake City Game File

OGG Origin Graphic File (OriginLab)

OGG Ogg Vorbis Codec Compressed WAV File

OGL Overlay Source Code

OGM Origin Matrix File (OriginLab)

OGM Ogg Vorbis Compressed Video File

OGNC Web Page Source Code

OGO OriginPro Graphic Object File (OriginLab)

OGS Origin Script File (OriginLab)

OGW Origin Worksheet File (OriginLab)

OGX C++ Component Gallery Exported Classes and Resources (Borland Software Corporation)

OH Overhoor ( DrillAssistant) List (Efkasoft)

OH4 Overhoor ( DrillAssistant) List (Efkasoft)

OHC OpenHelp Table of Contents File (Borland Software Corporation)

OHI OpenHelp Index (Borland Software Corporation)

OHL OpenHelp Link (Borland Software Corporation)

OHP OpenHelp Project File (Borland Software Corporation)

OHP DOS 7 File

OHS Bink Outbound History

OHW Overhoor ( DrillAssistant) List (Efkasoft)

OID Prosa/OM Object Interaction Diagram

OIF QuickBase Web-sharable Database Interchange File

OIK Lenné3D Plant Distribution File (Lenné3D GmbH i.G.)

OIL Open Image Library Format

OIT SleepScan and Ceegraph Offset Index File (Bio-logic Systems Corp.)

OIX Lenné3D Plant Distribution File (Lenné3D GmbH i.G.)

OJP 3WayPack (The Three-Mode Company)

OK Dot OK File Digest (John Oberschelp)

OKS OKScript File (Mike Mardesich)

OKT Oktalyzer Tracker Module

OKX OKScript File (Mike Mardesich)

OLB PSpice Capture Symbols Models (OrCAD)

OLB AUTOGEN

OLB Medical Terminology Challenge Data File (Delmar Learning)

OLB VAX Object Library

OLB Automation Object Library (Microsoft Corporation)

OLD Old Version

OLE Object Linking and Embedding (OLE) Object

OLF OyezForms Legal Documents (UK) (Oyez)

OLI Olivetti Text File

OLK MS Mail Mailbag Lock

OLK Outlook Address Book (Microsoft)

OLL TrialDirector Object Load List

OLN Visual C++ Outline Examples (Microsoft)

OLR Openlab Raw Format (Improvision)

OLRW Openlab Raw Format (Improvision)

OLT Visual C++ Outline Examples (Microsoft)

OLV OnLive! Traveler Sound File (The Digital Space Commons)

OLV OyezForms Legal Documents (UK) (Oyez)

OM Omicron Compiler File

OMA Sony Music Format File (Sony)

OMD Prosa/OM Class Model

OMF Open Media Format File

OMG OpenMG Jukebox (Sony)

OMN Omnipotent, Inc. Collection File

OMO Oracle Media Objects File

OMS Omega Downloader Configuration File

OMS Macintosh MP3 Music Format

OMS Briggs Softworks Order Maven

OMX OMAX Make Tool Path File (OMAX Corporation)

OMX Ots Media Library (Ots Labs Pty Ltd)

ON Audio Utility Tuningwrench Compressed File

OND Notes Database (IBM)

ONE OneNote Note File (Microsoft)

ONE EdgeCAM Licensing Data Ffile (Pathtrace Engineering Systems)

ONE docPointer Visual ReadMe File (docPointer)

ONE SEMONE Compressed Archive

ONF Open Navigation Format File

ONX Onyx Graphics Postershop File

OO Free Pascal Object File for OS/2 Version (FPC Development Team)

OOM Shroom Swap File

OOP OOP Packer Archive (TonyTown Software Ltd.)

OP Rescue Disk File

OP Origin Preprocessed Origin C File (OriginLab Corporation)

OP2 Musplay 1.72 File

OP2 Outpost 2 Saved Game

OPA Psion OPL Object File (Psion PLC)

OPC Office Upgrade Control File (Microsoft)

OPC Beta 44 Job File

OPC Omron OPC Client File

OPD OmniPage Document (ScanSoft, Inc.)

OPD Durango Interferometry Software Document (Diffraction International)

OPF Visual OMP Project File (DNA Software, Inc.)

OPF Obsidium Project File (Obsidium Software)

OPF Gemstar eBook Publisher Package (Gemstar eBook)

OPF Flip Album File

OPF KEPServerEX Project Configuration File (Kepware Technologies Inc.)

OPI OmniPass Exported User (Softex, Inc.)

OPJ Origin Project File (OriginLab)

OPJ OrCAD Project File (Cadence Design Systems, Inc.)

OPJ OmniPage Schedule (ScanSoft, Inc.)

OPK Origin Origin Pack File (OriginLab)

OPL Psion Organiser Programming Language Source File (Psion PLC)

OPM Quadrox Digital CCTV System Components

OPN Rebel Strip Poker Opponent File (Rebel Software)

OPN Court Opinion File (Tennessee Administrative Office of the Courts)

OPN Strip Poker Deluxe Opponent File (Eagle Rock Enterprises, Inc.)

OPN Exact Active Options

OPO Psion OPL Output Executable File (Psion PLC)

OPO Psion Organiser OPL Code (Psion PLC)

OPP IPhoto File (Keronsoft)

OPS Dynamite VSP Object Placement Style (3am Solutions (UK) Limited)

OPS Office Profile Settings File (Microsoft)

OPT Developer Studio File Workspace Options (Microsoft)

OPT QEMM Optimize

OPT ProWORX Nxt List Module Option File (Schneider Electric)

OPT Options/Configuration

OPT Delphi Project Options (Borland Software Corporation)

OPT Psion Organiser OPL Source (Psion PLC)

OPT pcAnywhere Option Set File

OPT Business Integrator Option File (Pervasive Software Inc.)

OPT Segue SilkTest Option Set File

OPW OrgPlus Organization Chart (HumanConcepts, LLC)

OPX Flip Album File

OPX OPL Extension DLL

OPX OrgChart Organization Diagram (Microsoft Corporation)

OPX Psion Organiser Programming Language (Psion PLC)

OPX Exact Inactive Options

OPX OrgPlus Organization Chart (HumanConcepts, LLC)

OQY Excel OLAP Query File (Microsoft)

OR2 Organizer Ver 2 File (IBM)

OR3 Organizer 97 File (IBM)

OR4 Organizer (IBM)

OR5 Organizer (IBM)

OR6 Organizer Data File (IBM)

OR8 Rational Rose Oracle8 Database Model Report (IBM)

ORA Oracle 7 Configuration

ORC cSound Synthesis Instruments (Csounders)

ORC Oracle 7 Script

ORC Digital Orchestrator Plus Sound File (Voyetra Turtle Beach, Inc.)

ORD OMAX Make Tool Path File (OMAX Corporation)

ORD BC45 Owl File

ORE 3WayPack (The Three-Mode Company)

ORF Descent 3 Outrage Room Format

ORF Olympus Digital Camera Raw Image File

ORG Hollywood FX Effects Organizer File (Pinnacle Systems, Inc.)

ORG Origin File

ORG Netmino File

ORG Microcal Origin Plot

ORG Organiser (IBM)

ORG Odds Ratio Generator Data File (Psytek Ltd.)

ORI Need for Speed-Hot Pursuit 2 File

ORI Original

ORIG Gen Original File

ORIGINAL Netobjects Fusion Components BBScomp Message File

ORO 3WayPack (The Three-Mode Company)

OS3 OS/2 Warp 3 File

OSC Formula One 2001 Options File

OSC Fruitypro Samples SS_effects File

OSC Remote Installation Services Client Installation Wizard File (Microsoft)

OSC OptionScope Worksheet (Equis International)

OSD Open Software Description File (Microsoft)

OSD SoftGrid Program Description (Softricity, Inc.)

OSF ICZ OriSAFE

OSF Distribution Bin File

OSF Descent 3 Sound File (Outrage Entertainment)

OSF Opera Skin (Opera Software ASA)

OSG OSG321 Software Application Data File

OSI Osiris Database (The Shmoo Group)

OSI SunNet OSI Description File (Sun)

OSL OckamSoft Log File (Ockam Instruments, Inc.)

OSS Office Saved Search (Microsoft)

OST Exchange Offline File (Microsoft)

OST Tivoli Storage Manager File (IBM)

OST Outlook Offline File (Microsoft)

OTB On-the-air Bitmap

OTB Nokia Phone Graphics Editor (Nokia)

OTC OpenOffice/StarOffice OpenDocument (Ver 2) Chart Template (Sun Microsystems, Inc.)

OTF OnkoS Text Data File (OnkoS)

OTF Open Type Font Format

OTF OpenOffice/StarOffice OpenDocument (Ver 2) Formula Template (Sun Microsystems, Inc.)

OTG OpenOffice/StarOffice OpenDocument (Ver 2) Graphics Document Template (Sun Microsystems, Inc.)

OTH Origin Graph Properties File (OriginLab Corporation)

OTH Power Toys Other Folder Explorer Tool

OTH OpenOffice/StarOffice OpenDocument (Ver 2) HTML Text Template (Sun Microsystems, Inc.)

OTHERFOLDER Power Toys Other Folder Explorer Tool

OTI OpenOffice/StarOffice OpenDocument (Ver 2) Image Template (Sun Microsystems, Inc.)

OTL Fookes Super NoteTab Template File

OTL NoteTab Outline

OTL OpenTrap Event Log

OTL Z-Soft Type Foundry Font

OTL Ventura Publisher's Type Foundry Outline Editor format

OTM IMSI Micro Cookbook File (IMSI)

OTM Origin Matrix Template File (OriginLab)

OTM Outlook VBA Module (Microsoft)

OTN OmniPage Training File (ScanSoft, Inc.)

OTP Origin Graphic Template File (OriginLab)

OTP Top Secret Crypto Gold One Time Pad Key File (TAN$TAAFL Software Company)

OTP OpenOffice/StarOffice OpenDocument (Ver 2) Presentation Template (Sun Microsystems, Inc.)

OTS OpenOffice/StarOffice OpenDocument (Ver 2) Spreadsheet Template (Sun Microsystems, Inc.)

OTS OtsJuke Sound File

OTT Nokia Phone Ring Tone (Nokia)

OTT OpenOffice/StarOffice OpenDocument (Ver 2) Text Document Template (Sun Microsystems, Inc.)

OTW Origin Worksheet Template File (OriginLab)

OTX Olivetti Olitext Plus File

OU! OzWin CompuServe E-mail/Forum Access Outbound Messages Online

OUT Outlines or Output File

OUT Pro/ENGINEER Temporary File (PTC)

OUT OzWin CompuServe E-mail/Forum Access Outbound Messages

OUT MyInfo Documnet/Outline (Milenix Software)

OUT NovaBACKUP Backup Set (NovaStor Corporation)

OUT 3WayPack (The Three-Mode Company)

OUV Sphinx Open Ended Responses (Le Sphinx Développement)

OV OrgPlus OrgViewer File (HumanConcepts, LLC)

OV OpenInsight Database Overflow File (Revelation Software)

OV1 Program File - Overlay

OV2 Program File - Overlay

OV2 TomTom Point of Interest File (TomTom International BV)

OV3 Program File - Overlay

OVA Sierra Web Studio Graphic

OVA Web Studio Project Page (Back To The Beach Software, LLC)

OVB OnkoS Vocabulary Backup File (OnkoS)

OVD ObjectVision Datafile (Application) (Borland Software Corporation)

OVE Cakewalk Overture Score (Cakewalk)

OVL RollerCoaster Tycoon Program Sprite (Atari)

OVL Program File - Overlay

OVLDEF Gestionnaire d'extensions Overload Definition (Définition de surcharge) (Francis Gagné)

OVM BHV Tonstudio Platin File

OVR Program File - Overlay

OVW Cubase .WAV File Image (Steinberg)

OVW DIANA Overview File

OVW Cool Edit Pro Overview File

OVX Psion Oval Control (Psion PLC)

OW Free Pascal Object File for Windows Version (FPC Development Team)

OWD OpenWire Project

OWF OnkoS Wave Data File (OnkoS)

OWL BC45 Owl File

OWS Web Studio Project File (Back To The Beach Software, LLC)

OX Ox Object-Oriented Matrix Programming Language File

OXB OlapX Report Portfolio (OlapX Software)

OXC OlapX Cube Definition File (OlapX Software)

OXL OMEGA Product Suite File

OXO Ox Object-Oriented Matrix Programming Language File

OXO DB-MAIN Compiled Voyager-2 Program

OXV OlapX Local View File (OlapX Software)

OYB Organize Your Beanie Babies Data File

OYZ Lotus Approach Alternate dBASE Index

OZF Mozart Programming System Functor (Mozart Board)

OZF2 OziExplorer Map (Des & Lorraine Newman)

OZFX3 OziExplorer Image File (Des & Lorraine Newman)

OZM Sharp Organizer Memo Bank

OZP Sharp Organizer Telephone Bank

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