File formats starting with a letter O

File formats starting with a letter 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
I cannot see the file extensions. What should I do?

File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.