Alphabetic File Extension List

The file extension list you requested is shown on this page. It loads as a table so please give it a moment as some of the lists are quite long. These lists contain basic information: the extension, the name of the program it works with, the specific function of the file, and the company that makes the program. Not all extensions have all of the data. Click on the extension of interest to see the detail page for that extension. Total extensions in this particular list: 522.

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Extension Information
O Object File
O UNIX/GCC Object File
O Origin C Compiled Program File (OriginLab Corporation)
O Free Pascal Object FIle for Linux or DOS Version (FPC Development Team)
O Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
O Xcode Compiled Core C or Assembler Program (Apple Inc.)
O Executable and Linkable Format File
O$$ Output File
O$$ Sprint Outfile
O01 Typhoon Voice File
O1 Free Pascal Object File for GO321v1 Platform (FPC Development Team)
O1 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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 Corporation)
OAF ETH Oberon Applet File
OAF Outrage Animation Rows
OAF Flight Simulator Texture File (Microsoft Corporation)
OAH2DSK Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OARC Optix Archive Bundle (mindwrap, inc.)
OARC Optix Archive Manifest (mindwrap, inc.)
OAZ NetFax Manager OAZ Fax File
OB IMB LinkWay Object File
OB ABF Outlook Backup Backup File (ABF software, Inc.)
OB! Orbit Downloader Incomplete Download (OrbitDownloader.com)
OB$ Compressed OBJ (Microsoft Corporation)
OB1 OzWin CompuServe E-mail/Forum Access Saved Outbox File
OB3 Outlook Backup Full Backup File (ABF software, Inc.)
OB3 ORTIM Zeit Data (ORTIM Industrial Engineering Deutschland GmbH)
OBA Timespace X100 Digital Video Recorder Video File (Timespace Technology Ltd.)
OBD Office Binder Document (Microsoft Corporation)
OBD Oracle Forms Online Help File (Oracle)
OBE Out Of Box Experience
OBE System DLL Oobe File
OBJ Metatools Object Bryce Support File
OBJ Relocatable Object Code
OBJ Wavefront 3D Object
OBJ LightWave 3D Object (NewTek)
OBJ Blender 3D Object (The Blender Foundation)
OBJ Hyperion-CADRazor 3D Model (TITAN Algorithms)
OBJ UVMapper Object (Stephen L Cox)
OBJ0 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OBJ1 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OBJECTS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OBK Oxygen Phone Manager Phone Book (Oxygen Software)
OBK Ubi Soft Chessmaster Opening Book File
OBML Opera Mini Saved Web Page (Opera Software ASA)
OBN Oberon-2 Module Source File
OBP Bryce 5 Object Preset (DAZ Productions)
OBPACK ObjectBar Object Package (Stardock Corporation, Inc.)
OBR C++ Object Browser Data File (Borland Software Corporation)
OBR Objective Reference Document Link (Objective Corporation Limited)
OBS ObjectScript Script
OBS OzWin CompuServe E-mail/Forum Access Saved Outbox File
OBSKIN ObjectBar Skin File (Stardock Corporation, Inc.)
OBT Office Binder Template (Microsoft Corporation)
OBTHEME ObjectBar Theme File
OBTHEME ObjectBar Theme File (Stardock Corporation, Inc.)
OBV ObjectScript Visual Interface
OBW Superior Drummer 2.0 Superior Drummer 2.0 (TOONTRACK)
OBX Rational XDE (IBM)
OBX OpenBook OpenBook 8.0 Document File (Freedom Scientific, Inc)
OBZ Office Binder Wizard (Microsoft Corporation)
OC8 OrgCon 8 Organization (EcoMerc)
OC9 OrgCon 9 Organization (EcoMerc)
OCA Control Typelib Cache (Microsoft Corporation)
OCA OLE Custom Control Library Information
OCA Visual Basic Control Typelib Cache
OCB Origin Precompiled Origin C File (OriginLab Corporation)
OCC OptControlCentre Model File
OCC DB/TextWorks Database Terms and Words (Inmagic, Inc.)
OCCSAN Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OCD OrgCon 7 Organization (EcoMerc)
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
OCI openCanvas Image (System Products Co., Ltd.)
OCM AOL Advertising Control File (America Online, Inc.)
OCM Internet Odyssey 2 Update
OCM Netscape Communicator Aim File
OCN OneCable.net - Explorer Measurement Data File (OnTimeLine)
OCP Advanced Art Studio
OCP Offline Commander Project File
OCR FAXGrapper FAX Text File
OCS eDoc DigiSign Digitally Signed Document (Fujitsu Denmark)
OCSP Optix Scanner Plug-in (mindwrap, inc.)
OCT Octalizer Musical File
OCT Radiance Octree Format
OCTOPUSFONT Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OCX Object Linking and Embedding (OLE) Control Extension (Microsoft Corporation)
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 CALS Group IV Type 2 Raster Image
ODA ODA Document
ODA Used with OCX
ODA AIBO Audio Voice (Sony)
ODB Psion Organiser Datafile and LZ Diary File (Psion PLC)
ODB OpenOffice/StarOffice OpenDocument (Ver 2) Database (Sun Microsystems, Inc.)
ODB ABAQUS File (ABAQUS, Inc.)
ODB Organizers Database (ODB) Database (Organizers' Collaborative)
ODB Abaqus/CAE Binary Output File (Dassault Systèmes)
ODB ArcView Object Database ASCII File (ESRI)
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
ODD Coby Voice Recorder Format (Coby Electronics Corp.)
ODDS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ODE Office Object Data Embedding File (Microsoft Corporation)
ODF BattleZone Cartographers Guild File
ODF OnkoS Data (OnkoS)
ODF Open Document Interchange (ODIF)
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 Corporation)
ODM Opendisc Software (Opendisc)
ODM OpenOffice/StarOffice OpenDocument (Ver 2) Global Text Document (Sun Microsystems, Inc.)
ODM OverDrive Media Console Media Control File (OverDrive Inc.)
ODMP Optix Collection Package (mindwrap, inc.)
ODOCK ObjectDock Theme (Stardock Corporation)
ODP OpenOffice/StarOffice OpenDocument (Ver 2) Presentation (Sun Microsystems, Inc.)
ODP Analytics Parameters for Analysis Services (Actuate Corporation)
ODP Oedipus
ODS NCompass Labs Internet Script
ODS Outlook Express Mailbox (Microsoft Corporation)
ODS OpenOffice/StarOffice OpenDocument (Ver 2) Spreadsheet (Sun Microsystems, Inc.)
ODS# OpenOffice/StarOffice OpenDocument (Ver 2) Open Spreadsheet (Sun Microsystems, Inc.)
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 Open eBook Document (International Digital Publishing Forum (IDPF))
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 Audio Utility Tuningwrench Compressed File
OF LessDATA Video System OneFile File
OF MicroImages Outline Font (MicroImages, Inc.)
OFASTER Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OFC Open Financial Connectivity File
OFD ObjectView Form Defintion
OFD OfficeForms Form Data File (Toplevel Computing)
OFD 20-20 Office Sales E-magine File (20-20 Technologies)
OFF Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OFF 3D Mesh Object File Format
OFF Vector Graphic
OFFENSE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OFFICES Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OFL OtsTurntables Playlist (Ots Labs)
OFM Embroidery Design File
OFM Font (Adobe Systems Incorporated)
OFM OmniForm Form File (Nuance Communications, Inc.)
OFM PostScript Font Description File
OFM OfficeForms Blank Form File (Toplevel Computing)
OFN Office FileNew File (Microsoft Corporation)
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 Corporation)
OFW Toplevel Forms Form (Toplevel Computing Ltd)
OFX Olicom Fax
OFX Open Financial Exchange File
OGA Ogg Vorbis Audio Profile (Xiph.Org Foundation)
OGF Outrage Graphic Rows
OGF OnkoS Graphic File (OnkoS)
OGF2 MapViewGPS Map Coordinates File
OGF3 MapViewGPS Map Coordinates File
OGG Ogg Vorbis Codec Compressed Multimedia File (Xiph.Org Foundation)
OGG Origin Graphic File (OriginLab Corporation)
OGG Salt Lake City Game File
OGI OpenPBX Gateway Interface File (OpenPBX.org)
OGL Overlay Source Code
OGM Ogg Vorbis Compressed Video File
OGM Origin Matrix File (OriginLab Corporation)
OGNC Web Page Source Code
OGO Origin Pro Graphic Object File (OriginLab Corporation)
OGS Origin Script File (OriginLab Corporation)
OGV Theora Ogg Transport Stream Video File (Xiph.Org Foundation)
OGV Ogg Vorbis Video Profile (Xiph.Org Foundation)
OGW Origin Worksheet File (OriginLab Corporation)
OGX C++ Component Gallery Exported Classes and Resources (Borland Software Corporation)
OGX Ogg Vorbis Multiplex Profile (Xiph.Org Foundation)
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 DOS 7 File
OHP OpenHelp Project File (Borland Software Corporation)
OHS Bink Outbound History
OHSD HealthFrame OpenHealth Service Plug-in (Records For Living, Inc.)
OHW Overhoor ( DrillAssistant) List (Efkasoft)
OID ProCurve Manager Non-ProCurve Network Device File (Hewlett-Packard Development Company, L.P.)
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)
OK Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OKM OkMap Map Defining File (Gian Paolo Saliola)
OKS OKScript File (Mike Mardesich)
OKT Oktalyzer Tracker Module
OKX OKScript File (Mike Mardesich)
OLB OrCAD PSpice Capture Symbols Model (Cadence Design Systems, Inc.)
OLB AUTOGEN
OLB Automation Object Library (Microsoft Corporation)
OLB PSpice Capture Symbols Models (Cadence Design Systems, Inc.)
OLB VAX Object Library
OLB Medical Terminology Challenge Data File (Delmar Learning)
OLD Old Version
OLD Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OLDEST Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OLE Object Linking and Embedding (OLE) Object
OLF OyezForms Legal Documents (UK) (Oyez)
OLG OATS Log File (AmsterCHEM)
OLI Olivetti Text File
OLK MS Mail Mailbag Lock
OLK Outlook Address Book (Microsoft Corporation)
OLL TrialDirector Object Load List
OLL TrialDirector Load File (inData Corporation)
OLLIEFONT Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OLN Visual C++ Outline Examples (Microsoft Corporation)
OLR Openlab Raw Format (Improvision)
OLRW Openlab Raw Format (Improvision)
OLSR olsrd Configuration (olsr.org)
OLT Orbit Downloader List File (OrbitDownloader.com)
OLT Visual C++ Outline Examples (Microsoft Corporation)
OLV OnLive! Traveler Sound File (The Digital Space Commons)
OLV OyezForms Legal Documents (UK) (Oyez)
OM Omicron Compiler File
OMA Sony OpenMG Music Format File (Sony Corporation of America)
OMB Omnibus Offline Web Storage (Alfega Technologies, Inc.)
OMCS Office Manager Enterprise Document Archive (Softwarebuero Krekeler)
OMD Prosa/OM Class Model
OMF Open Media Format File
OMF Operation, Management & Finance Database (ENIAC Computing)
OMG O&O DiskImage Disk Image (O&O Software GmBH)
OMG OpenMG Jukebox (Sony)
OMN Omnipotent, Inc. Collection File
OMO Oracle Media Objects File
OMOD Oblivion Mod Manager Oblivion Mod Manager
OMP OpenMind Project (MatchWare A/S)
OMP Office Manager Pro Document Archive (Softwarebuero Krekeler)
OMS Briggs Softworks Order Maven
OMS Macintosh MP3 Music Format
OMS Omega Downloader Configuration File
OMX OMAX Make Tool Path File (OMAX Corporation)
OMX Ots Media Library (Ots Labs Pty Ltd)
ON Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ON Audio Utility Tuningwrench Compressed File
OND Notes Database (IBM)
ONE docPointer Visual ReadMe File (docPointer)
ONE OneNote Note File (Microsoft Corporation)
ONE EdgeCAM Licensing Data Ffile (Pathtrace Engineering Systems)
ONE SEMONE Compressed Archive
ONE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ONF Open Navigation Format File
ONLINE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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 Origin Preprocessed Origin C File (OriginLab Corporation)
OP Rescue Disk File
OP2 Musplay 1.72 File
OP2 Outpost 2 Saved Game
OP2 Stanford Research Systems Optimlelt File (Stanford Research Systems, Inc.)
OP2 NEi Nastran Binary Results Neutral File (Noran Engineering, Inc.)
OP73 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPA Psion OPL Object File (Psion PLC)
OPC Beta 44 Job File
OPC Office Upgrade Control File (Microsoft Corporation)
OPC Omron OPC Client File
OPD OmniPage Document (Nuance Communications, Inc.)
OPD Durango Interferometry Software Document (Diffraction International)
OPEN Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPENYOURMIND Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPF KEPServerEX Project Configuration File (Kepware Technologies Inc.)
OPF Gemstar eBook Publisher Package (Gemstar eBook)
OPF Obsidium Project File (Obsidium Software)
OPF Visual OMP Project File (DNA Software, Inc.)
OPF Flip Album File
OPI OmniPass Exported User (Softex, Inc.)
OPI ExpressRecognition Server OCR Processing Information File (Adlib Software)
OPJ OmniPage Schedule (Nuance Communications, Inc.)
OPJ OrCAD Project File (Cadence Design Systems, Inc.)
OPJ Origin Project File (OriginLab Corporation)
OPK Origin Origin Pack File (OriginLab Corporation)
OPL Psion Organiser Programming Language Source File (Psion PLC)
OPM Quadrox Digital CCTV System Components
OPML Outline Processor Markup Language
OPN Strip Poker Deluxe Opponent File (Eagle Rock Enterprises, Inc.)
OPN Exact Active Options
OPN Court Opinion File (Tennessee Administrative Office of the Courts)
OPN Rebel Strip Poker Opponent File (Rebel Software)
OPO Psion OPL Output Executable File (Psion PLC)
OPO Psion Organiser OPL Code (Psion PLC)
OPOS VirtuaSys Opos Script (VirtuaSys :: Sistemas Virtuais)
OPP IPhoto File (Keronsoft)
OPR OPRO X Browser Print Report File (OPRO Japan Co.,Ltd.)
OPS Dynamite VSP Object Placement Style (3am Solutions (UK) Limited)
OPS Office Profile Settings File (Microsoft Corporation)
OPT Delphi Project Options (Borland Software Corporation)
OPT Developer Studio File Workspace Options (Microsoft Corporation)
OPT Options/Configuration
OPT ProWORX Nxt List Module Option File (Schneider Electric)
OPT QEMM Optimize
OPT Segue SilkTest Option Set File
OPT Psion Organiser OPL Source (Psion PLC)
OPT pcAnywhere Option Set File
OPT Business Integrator Option File (Pervasive Software Inc.)
OPT Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPT FLEXnet Manager Options File (Acresso Software Inc.)
OPT PhotoScore Document (Neuratron Ltd)
OPTIONAL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPTNS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPUS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPW OrgPlus Organization Chart (HumanConcepts, LLC)
OPX OrgPlus Organization Chart (HumanConcepts, LLC)
OPX Exact Inactive Options
OPX Flip Album File
OPX OPL Extension DLL
OPX OrgChart Organization Diagram (Microsoft Corporation)
OPX Psion Organiser Programming Language (Psion PLC)
OPY OptiY Model (OptiY)
OQY Excel OLAP Query File (Microsoft Corporation)
OR Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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
ORA MyPaint Open Raster Image File (Open Raster)
ORC Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORC cSound Synthesis Instruments (Csounders)
ORC Oracle 7 Script
ORC Digital Orchestrator Plus Sound File (Voyetra Turtle Beach, Inc.)
ORCA Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORD OMAX Make Tool Path File (OMAX Corporation)
ORD Open Reminder Database (ITOpen.eu SOFTWARE)
ORD BC45 Owl File
ORE 3WayPack (The Three-Mode Company)
ORE Narbacular Drop Game Content (DigiPen Corporation)
ORF Descent 3 Outrage Room Format
ORF Olympus Digital Camera Raw Image File
ORG Organiser (IBM)
ORG Microcal Origin Plot
ORG Netmino File
ORG Origin File (OriginLab Corporation)
ORG Hollywood FX Effects Organizer File (Pinnacle Systems, Inc.)
ORG Odds Ratio Generator Data File (Psytek Ltd.)
ORG Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORG Yamaha Organ Flutes (Yamaha Corporation of America)
ORGAN Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORI Need for Speed-Hot Pursuit 2 File
ORI Original
ORIG Gen Original File
ORIG Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORIGINAL Netobjects Fusion Components BBScomp Message File
ORK Warhammer: Mark of Chaos Game Archive (Games Workshop Group PLC)
ORM Ormetis Workbench File (Ormetis S.A.S.)
ORMV Ormetis View File (Ormetis S.A.S.)
ORO 3WayPack (The Three-Mode Company)
ORV Oracom Video Format (Oracom Co. Ltd.)
OS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OS2 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OS3 OS/2 Warp 3 File
OSA W32/Sober-AD
OSB Sega Dreamcast Sound (One Shot Bank) (Sega of America, Inc.)
OSC OptionScope Worksheet (Equis International)
OSC Formula One 2001 Options File
OSC Fruitypro Samples SS_effects File
OSC Remote Installation Services Client Installation Wizard File (Microsoft Corporation)
OSD Open Software Description File (Microsoft Corporation)
OSD SoftGrid Program Description (Softricity, Inc.)
OSD Directory Opus Configuration File (GPSoftware)
OSDX Windows Search Connector (Microsoft Corporation)
OSF Descent 3 Sound File (Outrage Entertainment)
OSF Opera Skin (Opera Software ASA)
OSF Virtual Ticket (MetaCommunications)
OSF Distribution Bin File
OSF ICZ OriSAFE
OSG OpenSceneGraph ASCII Native Format (OSG Community)
OSI Osiris Database (The Shmoo Group)
OSI SunNet OSI Description File (Sun)
OSL OckamSoft Log File (Ockam Instruments, Inc.)
OSMALLER Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OSp On-Screen Takeoff (On Center Software, Inc.)
OSS Office Saved Search (Microsoft Corporation)
OST Exchange Offline Cache (Microsoft Corporation)
OST Outlook Offline Storage File (Microsoft Corporation)
OST Tivoli Storage Manager File (IBM)
OST On-Screen Takeoff Project (On Center Software, Inc.)
OSTANDARD Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OT OpenTeacher Word list (OpenTeachers Maintainers)
OTB Nokia Phone Graphics Editor (Nokia)
OTB On-the-air Bitmap
OTC OpenOffice/StarOffice OpenDocument (Ver 2) Chart Template (Sun Microsystems, Inc.)
OTF OpenOffice/StarOffice OpenDocument (Ver 2) Formula Template (Sun Microsystems, Inc.)
OTF Blu-ray Text Subtitle Font Information (Blu-ray Disc Association)
OTF OnkoS Text Data File (OnkoS)
OTF Open Type Font Format
OTG OpenOffice/StarOffice OpenDocument (Ver 2) Graphics Document Template (Sun Microsystems, Inc.)
OTH Origin Graph Properties File (OriginLab Corporation)
OTH OpenOffice/StarOffice OpenDocument (Ver 2) HTML Text Template (Sun Microsystems, Inc.)
OTH Power Toys Other Folder Explorer Tool
OTHERFOLDER Power Toys Other Folder Explorer Tool
OTHERS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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 Ventura Publisher's Type Foundry Outline Editor format
OTL Z-Soft Type Foundry Font
OTM Origin Matrix Template File (OriginLab Corporation)
OTM Outlook VBA Module (Microsoft Corporation)
OTM Micro Cookbook File (IMSI/Design LLC)
OTM Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OTM2 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OTN OmniPage Training File (Nuance Communications, Inc.)
OTO Autopano Project (Alexandre Jenny)
OTOSET OTOsuite Settings (GN Otometrics)
OTP OpenOffice/StarOffice OpenDocument (Ver 2) Presentation Template (Sun Microsystems, Inc.)
OTP Origin Graphic Template File (OriginLab Corporation)
OTP Top Secret Crypto Gold One Time Pad Key File (TAN$TAAFL Software Company)
OTRKEY OnlineTvRecorder Encoded Video (OnlineTvRecorder.com)
OTS OpenOffice/StarOffice OpenDocument (Ver 2) Spreadsheet Template (Sun Microsystems, Inc.)
OTS PSR-9000 (Yamaha Corporation of America)
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 Corporation)
OTX Olivetti Olitext Plus File
OU! OzWin CompuServe E-mail/Forum Access Outbound Messages Online
OUD Adlib ExpressRecognition Server User Defined Dictionary (Adlib Software)
OUT Pro/ENGINEER Temporary File (PTC)
OUT NovaBACKUP Backup Set (NovaStor Corporation)
OUT MyInfo Documnet/Outline (Milenix Software)
OUT 3WayPack (The Three-Mode Company)
OUT Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OUT NEi Nastran Tabular Output File (Noran Engineering, Inc.)
OUT Wireshark Traffic Log (Gerald Combs)
OUT PSpice Output File (Cadence Design Systems, Inc.)
OUT PSS/E (siemens)
OUT Outlines or Output File
OUT OzWin CompuServe E-mail/Forum Access Outbound Messages
OUTPUT Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OUV Sphinx Open Ended Responses (Le Sphinx Développement)
OUX PCCharge File (VeriFone)
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)
OVD OverDisk Disk Use Database (Elias Fotinis)
OVE Cakewalk Overture Score (Cakewalk)
OVER Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OVL RollerCoaster Tycoon Program Sprite (Infogrames Entertainment SA)
OVL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OVL PDP-10 Overlay (Pre-Virtual Memory)
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 Cool Edit Pro Overview File
OVW Cubase .WAV File Image (Steinberg)
OVW DIANA Overview File
OVX Psion Oval Control (Psion PLC)
OW Free Pascal Object File for Windows Version (FPC Development Team)
OWC OutWit Hub OutWit Catch db Format (OutWit Technologies)
OWD OpenWire Project
OWF OnkoS Wave Data File (OnkoS)
OWG OutWit Hub OutWit Gear db Format (OutWit Technologies)
OWL BC45 Owl File
OWLING Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OWM OutWit Hub OutWit Mashup XML Format (OutWit Technologies)
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 DB-MAIN Compiled Voyager-2 Program
OXO Ox Object-Oriented Matrix Programming Language File
OXT OpenOffice.org Extension (OpenOffice.org Community)
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
OZV ORTIM Zeit Project (ORTIM Industrial Engineering Deutschland GmbH)

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