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    File extensions starting with O

    O Object Format
    O01 Typhoon Voice
    O2C Objects To See 3D
    O8D OCTGN Deck
    O8G OCTGN Game Definition
    O8O Mediator 5 Repository Tabs Vorlagen.006
    O8S OCTGN Set
    OAB Microsoft Outlook Offline Address Book Format
    OAD Suite Notaro Document
    OAF Microsoft Flight Simulator Texture
    OAM Adobe Edge Overlay Format
    OAP Samsung Bada Signed Installation Package
    OAR OpenSimulator Archive Format
    OAS Microsoft Outlook Attachment Sniffer
    OAT Google Android RunTime Code
    OAV Microsoft Flight Simulator Texture
    OAW OpenArchitectureWare Workflow
    OAZ NetFax Manager OAZ Fax Image
    OB IBM LinkWay Object
    OB! Orbit Downloader Incomplete Download Format
    OB3 ABF Software Outlook Backup Backup
    OB5 TopLang OE Backup
    OBAK WinSQL Offline Backup
    OBB Google Android Opaque Binary Blob Format
    OBD Microsoft Office Binder Document Format
    OBF OsmAnd Offline GPS Vector Maps
    OBG ZBrush Mesh
    OBI Microsoft Outlook 2007/2010/2013 RSS Subscription Format
    OBJ 3D Object Format
    OBJX Metatools Object Bryce Support
    OBK OrCAD Capture Design Or Library
    OBL TrueSpace
    OBML Opera Mini Saved Web Page Format
    OBML15 Opera Mini 5.1 Saved Web Page
    OBP Bryce Object Format
    OBPACK ObjectBar Theme Pack
    OBR Borland C++ Object Browser Data
    OBS WAsP Obstacle List
    OBT Openbox Theme Format
    OBV 3D Photo Browser Thumbnail Cache
    OBW Toontrack Superior Drummer Audio Format
    OBX Rational XDE
    OBYX Obyx Control
    OBZ Compressed 3D Object Format
    OC3 OpenCanvas 3 Event Format
    OC4 OpenCanvas 4 Event Format
    OC5 OpenCanvas 5 Event Format
    OC9 OrgCon Organization
    OCA Custom Control Library Type Format
    OCAMLMAKEFILE Caml Programming Language Makefile
    OCB Origin Precompiled Origin C
    OCC Oceanic DataPool Format
    OCD OCAD Digitized Map Format
    OCDC Mathematica Document
    OCDF OneClickDigital Mp3 Audio Book
    OCE Open Catalog Extension Connection Format
    OCEN EdGCM Data
    OCF OM2 Cipher
    OCG Osprey Custom Graph
    OCI OpenCanvas Image Format
    OCM Netscape Communicator Aim
    OCP Advanced Art Studio Image
    OCR FaxGrapper FAX Transcribed Text Format
    OCT RADIANCE Octree Format
    OCTEST Xcode Objective-C Unit Test Bundle
    OCV OCV Training Data
    OCX ActiveX Control Format
    OC_ Compressed ActiveX Control
    OD Mascotte Mascopt Request Format
    OD1 Omnis 5 Database
    OD2 Omnis 5 Database
    OD3 Omnis Studio Database
    OD4-9 Omnis5 Database
    ODB ArcView Object Database ASCII Format
    ODC OpenOffice.org OpenDocument Format
    ODCCUBEFILE OpenDocument 1
    ODCNEWFILE Microsoft Office Data Connection
    ODCTABLEFILE Microsoft Office
    ODE Microsoft Office
    ODEX Google Android Optimized Executalbe
    ODF Open Document Interchange Format (ODIF)
    ODG OpenDocument Drawing Format
    ODH Microsoft Visual Studio Interface Definition Language
    ODI OpenOffice.org Image Format
    ODIF Open Document Interchange Format
    ODL Object Description Language Format
    ODM OpenOffice.org OpenDocument Global Text Document Format
    ODO ICUBE Online Operating System Write Document Format
    ODP OpenOffice.org OpenDocument Presentation Format
    ODS OpenDocument Spreadsheet Format
    ODT ODF Text Document Format
    ODT# OpenOffice.org Locked Document
    ODTPC Oracle User Productivity Kit Presentation
    ODTTF Microsoft Office Document Embedded Font
    ODV Ocean Data View Data
    ODVI LaTeX
    ODX Microsoft BizTalk Server Diagram Format
    OD_ Oracle Compressed Driver
    OEACCAOUNT Windows Mail
    OEACCOUNT Windows Mail Account Settings Format
    OEB Open EBook Format
    OECL Open EDA Component Library
    OEF Optim Export
    OEM OEM Install Data Format
    OEMIGACCOUNT Outlook Express Temporary
    OET ESignal Order Entry Ticket
    OEX Opera Add-on Format
    OFA Kodak OfotoNow
    OFB Oxygen Forensic Suite Backup
    OFC Open Financial Connectivity Format
    OFD ObjectView Form Definition
    OFF DEC 3D Object File Format
    OFFICEUI Microsoft Office UI Customization
    OFFSETS Offset
    OFL OtsTurntables Playlist
    OFM Adobe PostScript Font Description Format
    OFN MS Office File New (Other Office Documents)
    OFP Objecteering Project
    OFR OptimFROG Encoded Audio
    OFS OptimFROG Dualstream
    OFT Microsoft Outlook Template Format
    OFX Open Financial Exchange Format
    OGA Ogg Vorbis Audio Profile Format
    OGD Oracle Forms Graph
    OGF S.T.A.L.K.E.R. Model Format
    OGG Ogg Vorbis Audio Format
    OGL ATI Overlay Source Code
    OGM Ogg Vorbis Media Format
    OGNC Dynamic Web Page Format
    OGO Origin Graphic Object
    OGR OGR C++ Open Source Library
    OGS Origin Script Format
    OGV Ogg Vorbis Video Format
    OGW OriginLab Worksheet
    OGX Ogg Vorbis Multiplex Profile
    OGZ Cube 2 Sauerbraten Map Format
    OH DrillAssistant List
    OH4 Overhoor List
    OHP MS-DOS 7
    OHS Bink Outbound History
    OHW Overhoor DrillAssistant List
    OIF QuickBase Web-sharable Database Interchange
    OIL Open Image Library Format Image Format
    OJP 3WayPack
    OK Qedit
    OKM OkMap Map Defining
    OKOZO Okozo Desktop Animation
    OKR PowerRecover One Key Recovery
    OKS OKScript
    OKT Oktalyzer Music Module (MOD) Format
    OKX OKScript
    OL Valve Hammer Object Layout
    OLA Online Access Format
    OLB Microsoft Office OLE Object Library Format
    OLB2 CanOpener Library
    OLD Backup Plus Backup Format
    OLE Microsoft Object Linking And Embedding
    OLE2 Microsoft Office Binary Document Container Format
    OLF OyezForms Legal Documents
    OLK Microsoft Outlook Address Book Format
    OLK14CATEGORY Microsoft Outlook 2011 For Mac Category Format
    OLK14CONTACT Microsoft Outlook 2011 For Mac Contact Format
    OLK14DBHEADER Microsoft Outlook 2011 For Mac Database
    OLK14EVENT Outlook Calendar Event Format
    OLK14FOLDER Microsoft Outlook 2011 For Mac Folder
    OLK14GROUP Outlook Group Format
    OLK14MAILACCOUNT Microsoft Outlook 2011 For Mac Mail Account Settings Format
    OLK14MESSAGE Microsoft Outlook 2011 For Mac Message Format
    OLK14MSGATTACH Microsoft Outlook 2011 For Mac Message Attachment
    OLK14MSGSOURCE Microsoft Outlook 2011 For Mac Message Source Format
    OLK14NOTE Outlook Note Format
    OLK14PREF Microsoft Outlook 2011 For Mac Preferences Format
    OLK14RECENT Microsoft Outlook 2011 For Mac Recent Address
    OLK14RULE Microsoft Outlook 2011 For Mac Rule
    OLK14SCHEDULE Microsoft Outlook 2011 For Mac Schedule
    OLK14SEARCH Microsoft Outlook 2011 For Mac Saved Search
    OLK14SIGNATURE Microsoft Outlook 2011 For Mac Signature Format
    OLK14TASK Outlook Task Format
    OLK14UID Microsoft Outlook 2011 For Mac UID
    OLL TrialDirector Load
    OLM Microsoft Outlook For Mac Data Format
    OLN Microsoft Visual C++ Outline Examples
    OLPROJ Adobe OnLocation
    OLS Microsoft Office List Shortcut
    OLT Orbit Downloader Download List Format
    OLV Roller Coaster Tycoon
    OLY AFP Advanced Function Presentation Overlay Resource
    OMA Sony OpenMG Music Format
    OMC Origin Customized Menu
    OMCS Office Manager Access Format
    OMD MapInfo Routing J Server Data
    OMEG Mathematica For Mac
    OMF Open Media Framework Format
    OMFI Open Media Framework
    OMG O&O DiskImage Backup Format
    OML TracePro Model
    OMN Omnipotent Collection
    OMO OMake Object Format
    OMOD Oblivion Mod Manager Mod Format
    OMP Office Manager Pro Document Archive
    OMR OMR Template
    OMS Order Maven
    OMT SITH HLA Object Model Template
    OMX OtsAV Media Library Information Format
    ON2 On2 Encoded FLV
    OND Lotus Notes Format
    ONE Microsoft OneNote Document Format
    ONECACHE Microsoft OneNote Cache
    ONEPKG Microsoft OneNote Package Format
    ONETMP Microsoft OneNote Temporary
    ONETOC Microsoft OneNote Table Of Contents
    ONETOC2 Microsoft OneNote Table Of Contents Format
    ONM Outdoor Navigator Map
    ONT TheWord Module Format
    ONTX TheWord Encrypted Module Format
    ONW Omron HMI NTST
    ONX OnyxGrass Image
    OO3 Omni Group Outliner 3 Format
    OOG PyGraph Python Graphics Interface Object Oriented Graphics
    OOGL Geomview Object Oriented Graphics Library
    OOK Arachne Batch Script Format
    OOS OpenOffice.org Spreadsheet
    OOT OpenOffice.org Text
    OP ESignal OptionsPlus
    OP2 Outpost 2 Saved Game
    OP4 Nastran Output
    OPA Fly! RAW Image Opacity Map
    OPAL Microsoft Office Customization Tool (OCT) Language-specific Settings
    OPAX Microsoft Office Customization Tool (OCT) Standard Settings
    OPB Bryce Object
    OPC Microsoft Office 97 Upgrade Control
    OPD Durango Interferometry Software Document Format
    OPDOWNLOAD Opera Next Incomplete Download
    OPEF OmniPass Encrypted Folder
    OPENBSD OpenBSD Readme Format
    OPF Open Packaging Format
    OPG Offline Plan Generation Package
    OPI Adlib OCR Processing Information
    OPJ OrCAD Capture Project Format
    OPK Sinking Island/LIle Noyée Game
    OPLC Nokia Logo Format
    OPLM Outline Processor Markup Language
    OPML OPML Outline Processor Markup Language File Format
    OPN Court Opinion
    OPP IPhotoDVD
    OPPC Space Marine Game Resource Package
    OPQ Eschalon: Book I Game
    OPR OPRO X Browser
    OPS Microsoft Office Profile Settings Format
    OPT MySQL Database Data Format
    OPTIONS SE-SOFT Configuration Format
    OPTS Linux Configuration Options Format
    OPUS Opus Audio Format
    OPW OrgPlus For Windows Organization Chart
    OPX Microsoft Office Organization Chart File Format
    OPXT OrpPlus Template
    OPY OptiY Model
    OP_ GKSetup Support
    OQY Microsoft Excel OLAP Query Format
    OR2 Lotus Organizer 2 Format
    OR3 IBM Lotus Organizer 97 Format
    OR4 Lotus Organizer Data Format
    OR5 IBM Lotus Organizer Format
    OR6 Lotus Organizer Data Format
    OR8 Rational Rose Oracle8 Database Model Report
    ORA Oracle Database Parameter Configuration Format
    ORB Original EBook Reader Ebook
    ORC CSound Orchestra Midi Format
    ORDEREDTEST Microsoft Visual Studio Ordered Test Format
    ORE Ore Executable Format
    ORF Olympus Digital Camera Raw Image Format
    ORG Lotus Organiser Format
    ORG2+ Lotus Organizer
    ORI Original Format
    ORIG Original Format
    ORIGINAL Netobjects Fusion Components Bbscomp Message
    ORIGINAL_EPUB EPUB Ebook Backup
    ORIGINAL_MOBI MOBI Ebook Backup
    ORK Warhammer Mark Of Chaos Game Archive
    ORL Object-Relational Language
    ORMDESIGNER ORM Designer Project
    ORS DSP Group TrueSpeech Audio Format
    ORT COREX Orthographic Transcriptions Format
    ORV Oracom Video Format
    ORX RadiantOne Virtual Directory Server Database Schema
    ORZ Holic Game
    OS ObjectScript Source Format
    OS2 Os2 System
    OS3 OS/2 Warp 3
    OSA W32/Sober-AD
    OSAS Apple Script Library Tani Script
    OSAX FindFile OSAX Mac Format Type
    OSB OpenStreetMap Binary Map Format
    OSBX OneSafe Exported Backup
    OSC Remote Installation Services Client Installation Wizard Format
    OSCD TouchOSC Interface Editor Template
    OSD Open Software Description
    OSDX Microsoft Windows Search Connector Format
    OSF Descent 3 Sound
    OSG OSGJS JSON Input
    OSK Osu! Skin Format
    OSL OckamSoft Log
    OSM OpenStreetMap Data Format
    OSP OpenShot Project Format
    OSR Osu! Game Replay Format
    OSS Microsoft Office Saved Search Format
    OST Microsoft Outlook Inbox Off-line Folder Format
    OSU Osu! Dialog Format
    OSW ONESWING Contents
    OSX Apple Mac OS PowerPC Executable Format
    OSZ Osu! Beatmap Format
    OT TheWord Text Module Format
    OTA OTA Bitmap Format
    OTB Nokia OTA Bitmap Format
    OTC OpenDocument Chart Template Format
    OTD OpenIV Texture Data
    OTF OpenType Font File Format
    OTG OpenOffice.org Graphics Document Template
    OTH OpenOffice.org OpenDocument HTML Text Template
    OTI OpenDocument Image Template Format
    OTL Super NoteTab Template Format
    OTLN Opal Outline Format
    OTM Microsoft Outlook Macro Format
    OTP OpenOffice.org Presentation Template Format
    OTR IRIX Complied FTR
    OTRKEY OTRKEY Encoded Video Format
    OTS OpenOffice.org OpenDocument Spreadsheet Template Format
    OTT OpenOffice.org Text Document Template Format
    OTV Rotor-Disc OTV Kit OTV Calibration
    OTX TheWord Encrypted Module Format
    OTZ OpenLP Theme Format
    OUT Output Format
    OUTLINE FontTwister Letter Outline
    OUTLOOK97 Microsoft Outlook Custom Mail
    OUX Bibexcel
    OV OpenInsight Database Overflow
    OV1 Overlay
    OV2 TomTom Navigator Point Of Interest Format
    OV3 Overlay
    OV4 Overlay
    OV5 Overlay
    OVA Open Virtual Machine Format
    OVD ObjectVision Data
    OVE Overture Music Score Format
    OVF Open Virtualization Format Package
    OVG ObjectVision Converted Graphic
    OVH OMSI Bus Settings
    OVL Overlay Format
    OVOLOG OoVoo Log
    OVP The Overlay Maker Package Format
    OVPN OpenVPN Config Format
    OVR Overlay Format
    OVS Ovation 1 Style Sheet
    OVW Logic Pro Overview Format
    OW Free Pascal For Windows Object Format
    OWC OutWit Hub OutWit Catch Db Format
    OWG OutWit Hub OutWit Gear Outwit Thesaurus Db Format
    OWL OWL (Obfuscated Weird Language) Source Code Format
    OWM OutWit Hub OutWit Mashup XML Format
    OWR PeopleSoft Results Archive
    OWS Web Studio Project
    OWT Ancestry.com OneWorldTree
    OX Ox Object-Oriented Matrix Programming Language
    OXD PS3 Proxy Server
    OXF IBM Rational Rhapsody
    OXO Ox Object-Oriented Matrix Programming Language
    OXPS Windows 8 OpenXPS Document Format
    OXT OpenOffice.org Extension Help Format
    OXYGENE Oxygene Project Format
    OYX IBM Lotus Approach Alternate Database Index Format
    OYZ Lotus Approach Alternate DBASE Index
    OZ Opera Job Management Compressed Format
    OZF2 OziExplorer Map
    OZFX3 OziExplorer Image
    OZJ Mu Online Graphic
    OZP Orgadata LogiKal
    OZT Mu Online Texture