Add file extension

File extensions sorted alphabetically - starting with a letter O

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