Collector: Nosa Lee
Original Address: https://www.seeksunslowly.com/file-extensions-types-references-o
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_____________________________________

Now, I collected all the known file extensions/types for your reference, I grouped them according to the first character due to there are too many file extensions/types.

The following file extensions/types are grouped as O*, to refer to more file extensions/types or download them (a compressed txt file that separates the extension and description with ” : “), please click the following links.

A B C D E F G H I J K L M N

O P Q R S T U V W X Y Z
Number  Symbol

Download All File Types/Extensions in ONE Compressed File

O   Xcode Compiled Core C or Assembler Program (Apple Inc.)
O   Origin C Compiled Program File (OriginLab Corporation)
O   Free Pascal Object FIle for Linux or DOS Version (FPC Development Team)
O   UNIX/GCC Object File
O   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
O   Executable and Linkable Format File
O   Object File
O$$   Output File
O$$   Sprint Outfile
O01   Typhoon Voice File
O1   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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 Corporation)
OAF   Flight Simulator Texture File (Microsoft Corporation)
OAF   ETH Oberon Applet File
OAF   Outrage Animation Rows
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   ABF Outlook Backup Backup File (ABF software, Inc.)
OB   IMB LinkWay Object File
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   Relocatable Object Code
OBJ   Wavefront 3D Object
OBJ   UVMapper Object (Stephen L Cox)
OBJ   LightWave 3D Object (NewTek)
OBJ   Hyperion-CADRazor 3D Model (TITAN Algorithms)
OBJ   Blender 3D Object (The Blender Foundation)
OBJ   Metatools Object Bryce Support File
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   OzWin CompuServe E-mail/Forum Access Saved Outbox File
OBS   ObjectScript Script
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   OpenBook OpenBook 8.0 Document File (Freedom Scientific, Inc)
OBX   Rational XDE (IBM)
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   Netscape Communicator Aim File
OCM   AOL Advertising Control File (America Online, Inc.)
OCM   Internet Odyssey 2 Update
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   Radiance Octree Format
OCT   Octalizer Musical File
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   ODA Document
ODA   Used with OCX
ODA   AIBO Audio Voice (Sony)
ODA   CALS Group IV Type 2 Raster Image
ODB   Psion Organiser Datafile and LZ Diary File (Psion PLC)
ODB   Abaqus/CAE Binary Output File (Dassault Syst鑝es)
ODB   ABAQUS File (ABAQUS, Inc.)
ODB   OpenOffice/StarOffice OpenDocument (Ver 2) Database (Sun Microsystems, Inc.)
ODB   Organizers Database (ODB) Database (Organizers’ Collaborative)
ODB   ArcView Object Database ASCII File (ESRI)
ODC   OpenOffice/StarOffice OpenDocument (Ver 2) Chart (Sun Microsystems, Inc.)
ODC   Office Data Connection
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   OpenOffice/StarOffice OpenDocument (Ver 2) Formula (Sun Microsystems, Inc.)
ODF   Open Document Interchange (ODIF)
ODF   OnkoS Data (OnkoS)
ODF   BattleZone Cartographers Guild File
ODF   Star Trek Armada Ship/Structure Infomation
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   Visual C++ Type Library Source (Interface Definition Language File) (Microsoft Corporation)
ODL   Object Definition Language
ODM   OverDrive Media Console Media Control File (OverDrive Inc.)
ODM   Opendisc Software (Opendisc)
ODM   OpenOffice/StarOffice OpenDocument (Ver 2) Global Text Document (Sun Microsystems, Inc.)
ODMP   Optix Collection Package (mindwrap, inc.)
ODOCK   ObjectDock Theme (Stardock Corporation)
ODP   Oedipus
ODP   Analytics Parameters for Analysis Services (Actuate Corporation)
ODP   OpenOffice/StarOffice OpenDocument (Ver 2) Presentation (Sun Microsystems, Inc.)
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   SB_AWE Keys SB_NT File
OEM   OEM Data Used During Device Install
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   OfficeForms Form Data File (Toplevel Computing)
OFD   20-20 Office Sales E-magine File (20-20 Technologies)
OFD   ObjectView Form Defintion
OFF   3D Mesh Object File Format
OFF   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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   OfficeForms Blank Form File (Toplevel Computing)
OFM   Embroidery Design File
OFM   Font (Adobe Systems Incorporated)
OFM   PostScript Font Description File
OFM   OmniForm Form File (Nuance Communications, Inc.)
OFN   Office FileNew File (Microsoft Corporation)
OFN   Systems Management Server (SMS) Offer Creation Notification (Microsoft Corporation)
OFR   Systems Management Server (SMS) Offer Description File (Microsoft Corporation)
OFR   OptimFROG Encoded Audio (Florin Ghido)
OFT   Outlook Item Template (Microsoft Corporation)
OFW   Toplevel Forms Form (Toplevel Computing Ltd)
OFX   Open Financial Exchange File
OFX   Olicom Fax
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   Origin Graphic File (OriginLab Corporation)
OGG   Salt Lake City Game File
OGG   Ogg Vorbis Codec Compressed Multimedia File (Xiph.Org Foundation)
OGI   OpenPBX Gateway Interface File (OpenPBX.org)
OGL   Overlay Source Code
OGM   Origin Matrix File (OriginLab Corporation)
OGM   Ogg Vorbis Compressed Video File
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   OpenHelp Project File (Borland Software Corporation)
OHP   DOS 7 File
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   Lenn�Plant Distribution File (Lenn�GmbH i.G.)
OIL   Open Image Library Format
OIT   SleepScan and Ceegraph Offset Index File (Bio-logic Systems Corp.)
OIX   Lenn�Plant Distribution File (Lenn�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   VAX Object Library
OLB   Medical Terminology Challenge Data File (Delmar Learning)
OLB   AUTOGEN
OLB   Automation Object Library (Microsoft Corporation)
OLB   PSpice Capture Symbols Models (Cadence Design Systems, Inc.)
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 Load File (inData Corporation)
OLL   TrialDirector Object Load List
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   OyezForms Legal Documents (UK) (Oyez)
OLV   OnLive! Traveler Sound File (The Digital Space Commons)
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   Operation, Management & Finance Database (ENIAC Computing)
OMF   Open Media Format File
OMG   O&O DiskImage Disk Image (O&O Software GmBH)
OMG   OpenMG Jukebox (Sony)
OMN   Omnipotent, Inc. Collection File
OMO   Oracle Media Objects File
OMP   Office Manager Pro Document Archive (Softwarebuero Krekeler)
OMP   OpenMind Project (MatchWare A/S)
OMS   Macintosh MP3 Music Format
OMS   Briggs Softworks Order Maven
OMS   Omega Downloader Configuration File
OMX   Ots Media Library (Ots Labs Pty Ltd)
OMX   OMAX Make Tool Path File (OMAX Corporation)
ON   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ON   Audio Utility Tuningwrench Compressed File
OND   Notes Database (IBM)
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)
ONE   docPointer Visual ReadMe File (docPointer)
ONE   OneNote Note File (Microsoft Corporation)
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   Rescue Disk File
OP   Origin Preprocessed Origin C File (OriginLab Corporation)
OP2   NEi Nastran Binary Results Neutral File (Noran Engineering, Inc.)
OP2   Musplay 1.72 File
OP2   Stanford Research Systems Optimlelt File (Stanford Research Systems, Inc.)
OP2   Outpost 2 Saved Game
OP73   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPA   Psion OPL Object File (Psion PLC)
OPC   Omron OPC Client File
OPC   Beta 44 Job File
OPC   Office Upgrade Control File (Microsoft Corporation)
OPD   Durango Interferometry Software Document (Diffraction International)
OPD   OmniPage Document (Nuance Communications, Inc.)
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   Visual OMP Project File (DNA Software, Inc.)
OPF   Obsidium Project File (Obsidium Software)
OPF   KEPServerEX Project Configuration File (Kepware Technologies Inc.)
OPF   Gemstar eBook Publisher Package (Gemstar eBook)
OPF   Flip Album File
OPI   OmniPass Exported User (Softex, Inc.)
OPI   ExpressRecognition Server OCR Processing Information File (Adlib Software)
OPJ   OrCAD Project File (Cadence Design Systems, Inc.)
OPJ   Origin Project File (OriginLab Corporation)
OPJ   OmniPage Schedule (Nuance Communications, Inc.)
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   Rebel Strip Poker Opponent File (Rebel Software)
OPN   Court Opinion File (Tennessee Administrative Office of the Courts)
OPN   Exact Active Options
OPN   Strip Poker Deluxe Opponent File (Eagle Rock Enterprises, Inc.)
OPO   Psion Organiser OPL Code (Psion PLC)
OPO   Psion OPL Output Executable File (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   Developer Studio File Workspace Options (Microsoft Corporation)
OPT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OPT   Delphi Project Options (Borland Software Corporation)
OPT   Psion Organiser OPL Source (Psion PLC)
OPT   Business Integrator Option File (Pervasive Software Inc.)
OPT   Options/Configuration
OPT   ProWORX Nxt List Module Option File (Schneider Electric)
OPT   Segue SilkTest Option Set File
OPT   QEMM Optimize
OPT   PhotoScore Document (Neuratron Ltd)
OPT   pcAnywhere Option Set File
OPT   FLEXnet Manager Options File (Acresso Software Inc.)
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   Flip Album File
OPX   OPL Extension DLL
OPX   OrgPlus Organization Chart (HumanConcepts, LLC)
OPX   Exact Inactive Options
OPX   Psion Organiser Programming Language (Psion PLC)
OPX   OrgChart Organization Diagram (Microsoft Corporation)
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   MyPaint Open Raster Image File (Open Raster)
ORA   Oracle 7 Configuration
ORC   Oracle 7 Script
ORC   Digital Orchestrator Plus Sound File (Voyetra Turtle Beach, Inc.)
ORC   cSound Synthesis Instruments (Csounders)
ORC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORCA   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORD   OMAX Make Tool Path File (OMAX Corporation)
ORD   BC45 Owl File
ORD   Open Reminder Database (ITOpen.eu SOFTWARE)
ORE   Narbacular Drop Game Content (DigiPen Corporation)
ORE   3WayPack (The Three-Mode Company)
ORF   Olympus Digital Camera Raw Image File
ORF   Descent 3 Outrage Room Format
ORG   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORG   Hollywood FX Effects Organizer File (Pinnacle Systems, Inc.)
ORG   Origin File (OriginLab Corporation)
ORG   Netmino File
ORG   Yamaha Organ Flutes (Yamaha Corporation of America)
ORG   Microcal Origin Plot
ORG   Odds Ratio Generator Data File (Psytek Ltd.)
ORG   Organiser (IBM)
ORGAN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORI   Need for Speed-Hot Pursuit 2 File
ORI   Original
ORIG   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ORIG   Gen Original File
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   Remote Installation Services Client Installation Wizard File (Microsoft Corporation)
OSC   Formula One 2001 Options File
OSC   Fruitypro Samples SS_effects File
OSD   Directory Opus Configuration File (GPSoftware)
OSD   Open Software Description File (Microsoft Corporation)
OSD   SoftGrid Program Description (Softricity, Inc.)
OSDX   Windows Search Connector (Microsoft Corporation)
OSF   Descent 3 Sound File (Outrage Entertainment)
OSF   Opera Skin (Opera Software ASA)
OSF   Distribution Bin File
OSF   Virtual Ticket (MetaCommunications)
OSF   ICZ OriSAFE
OSG   OpenSceneGraph ASCII Native Format (OSG Community)
OSI   SunNet OSI Description File (Sun)
OSI   Osiris Database (The Shmoo Group)
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   Tivoli Storage Manager File (IBM)
OST   On-Screen Takeoff Project (On Center Software, Inc.)
OST   Outlook Offline Storage File (Microsoft Corporation)
OST   Exchange Offline Cache (Microsoft Corporation)
OSTANDARD   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OT   OpenTeacher Word list (OpenTeachers Maintainers)
OTB   On-the-air Bitmap
OTB   Nokia Phone Graphics Editor (Nokia)
OTC   OpenOffice/StarOffice OpenDocument (Ver 2) Chart Template (Sun Microsystems, Inc.)
OTF   OpenOffice/StarOffice OpenDocument (Ver 2) Formula Template (Sun Microsystems, Inc.)
OTF   Open Type Font Format
OTF   Blu-ray Text Subtitle Font Information (Blu-ray Disc Association)
OTF   OnkoS Text Data File (OnkoS)
OTG   OpenOffice/StarOffice OpenDocument (Ver 2) Graphics Document Template (Sun Microsystems, Inc.)
OTH   OpenOffice/StarOffice OpenDocument (Ver 2) HTML Text Template (Sun Microsystems, Inc.)
OTH   Origin Graph Properties File (OriginLab Corporation)
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   NoteTab Outline
OTL   Z-Soft Type Foundry Font
OTL   Ventura Publisher’s Type Foundry Outline Editor format
OTL   Fookes Super NoteTab Template File
OTL   OpenTrap Event Log
OTM   Outlook VBA Module (Microsoft Corporation)
OTM   Origin Matrix Template File (OriginLab Corporation)
OTM   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OTM   Micro Cookbook File (IMSI/Design LLC)
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   Top Secret Crypto Gold One Time Pad Key File (TAN$TAAFL Software Company)
OTP   Origin Graphic Template File (OriginLab Corporation)
OTRKEY   OnlineTvRecorder Encoded Video (OnlineTvRecorder.com)
OTS   OtsJuke Sound File
OTS   OpenOffice/StarOffice OpenDocument (Ver 2) Spreadsheet Template (Sun Microsystems, Inc.)
OTS   PSR-9000 (Yamaha Corporation of America)
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   NEi Nastran Tabular Output File (Noran Engineering, Inc.)
OUT   PSS/E (siemens)
OUT   PSpice Output File (Cadence Design Systems, Inc.)
OUT   OzWin CompuServe E-mail/Forum Access Outbound Messages
OUT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OUT   Outlines or Output File
OUT   MyInfo Documnet/Outline (Milenix Software)
OUT   Wireshark Traffic Log (Gerald Combs)
OUT   3WayPack (The Three-Mode Company)
OUT   Pro/ENGINEER Temporary File (PTC)
OUT   NovaBACKUP Backup Set (NovaStor Corporation)
OUTPUT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OUV   Sphinx Open Ended Responses (Le Sphinx D関eloppement)
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   PDP-10 Overlay (Pre-Virtual Memory)
OVL   RollerCoaster Tycoon Program Sprite (Infogrames Entertainment SA)
OVL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
OVL   Program File – Overlay
OVLDEF   Gestionnaire d’extensions Overload Definition (D閒inition de surcharge) (Francis Gagn�)
OVM   BHV Tonstudio Platin File
OVR   Program File – Overlay
OVW   DIANA Overview File
OVW   Cubase .WAV File Image (Steinberg)
OVW   Cool Edit Pro 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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