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# 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

O File Extensions

File types with extensions that start with the letter O

Extension File Type File Description
.oDeveloperCompiled Object File
.oabDataOffline Address Book
.oarCompressedOpenSimulator Archive
.ob!MiscOrbit Downloader Incomplete Download
.obdDataOffice Binder Document
.obiSettingsOutlook RSS Subscription File
.obj3D Image3D Object File
.objDataRelocatable Object Code
.obmlWebOpera Mini Saved Web Page
.obp3D ImageBryce Object File
.obtSettingsOpenbox Theme File
.obz3D ImageCompressed 3D Object File
.ocaDeveloperCustom Control Library Type File
.oceSettingsOpen Catalog Extension Connection File
.ocrTextFAXGrapper Fax Text File
.oct3D ImageRadiance Octree File
.octestDeveloperXcode Objective-C Unit Test Bundle
.ocxDeveloperActiveX Control
.odDataMascopt Graph Request File
.odbDatabaseOpenOffice.org Base Database
.odbDatabaseABAQUS Database
.odcDataOpenDocument Chart File
.odcSettingsOffice Data Connection File
.odfGameBattlezone Object Definition File
.odfMiscOpenDocument Formula
.odfDataOpen Document File
.odgVector ImageOpenDocument Graphic File
.odiRaster ImageOpenDocument Image
.odifTextOpen Document Interchange Format
.odmAudioOverDrive Media File
.odmTextOpenDocument Master Document
.odoTextOnline Operating System Write Document
.odpDataOpenDocument Presentation
.odsSpreadsheetOpenDocument Spreadsheet
.odsMiscOutlook Express 5 Mailbox
.odtTextOpenDocument Text Document
.odxDataBizTalk Server Orchestration File
.oeaccountDataWindows Mail Account File
.oebBackupOutlook Express Backup Wizard File
.oebDataOpen eBook File
.oemSettingsOEM Setup File
.oexPluginOpera Extension
.ofcDataOpen Financial Connectivity File
.off3D ImageObject File Format
.oflTextOts File List
.ofmDataOmniForm Form
.ofrMiscSMS Offer Manager File
.ofrAudioOptimFROG Audio File
.oftDataOutlook File Template
.ofxDataOpen Financial Exchange File
.ogaAudioOgg Vorbis Audio File
.ogf3D ImageS.T.A.L.K.E.R. Model File
.oggAudioOgg Vorbis Audio File
.ogmVideoOgg Media File
.ogncWebDynamic Web Page
.ogvVideoOgg Video File
.ogxVideoOgg Vorbis Multiplexed Media File
.ogzGameCube 2 Map File
.oktAudioOktalyzer Module
.olaPage LayoutOnline Access File
.olbMiscOLE Object Library
.olbCADOrCAD Symbol Library File
.oldBackupBackup File
.olkDataOutlook Address Book File
.olk14categoryDataOutlook Category File
.olk14contactDataOutlook Contact File
.olk14eventDataOutlook Calendar Event File
.olk14groupDataOutlook Group File
.olk14mailaccountDataOutlook Mail Account File
.olk14messageDataOutlook Message File
.olk14msgsourceDataOutlook Email Message Data File
.olk14noteDataOutlook Note File
.olk14prefSettingsOutlook Preferences File
.olk14signatureDataOutlook Signature File
.olk14taskDataOutlook Task File
.oltDataOrbit Downloads List
.omaAudioSony OpenMG Music File
.omcsDataOffice Manager Access File
.omfRaster ImageOMF Interchange Image File
.omfAudioOpen Media Framework File
.omgAudioOpenMG Audio File
.omoDeveloperOMake Object File
.omodGameOblivion Mod Archive
.ompDataOffice Manager Document Archive
.omxAudioOtsAV Media Library Information File
.ondDataLotus Notes Encapsulated Memo File
.oneDataOneNote Document
.onepkgBackupMicrosoft OneNote Package File
.onetoc2SettingsMicrosoft OneNote Table of Contents File
.oo3DataOmniOutliner 3 File
.opdPage LayoutOmniPage Document
.opdDataDurango Document
.openbsdTextOpenBSD Readme File
.opfMiscOpen Packaging Format File
.opfDataFlipViewer FlipBook File
.opfMiscFlipAlbum File
.opjCADOrCAD Project File
.opmlWebOutline Processor Markup Language File
.opsSettingsOffice Profile Settings File
.optCADOpterecenja File
.optSettingsOptions File
.optsSettingsLinux Configuration Options File
.opxDataFlipAlbum Photo Album File
.opxDataOrgPlus Org Chart
.oqyDatabaseExcel OLAP Query File
.or2DataLotus Organizer 2 File
.or3DataIBM Lotus Organizer 97 File
.or4DataIBM Lotus Organizer 97 GS File
.or5DataLotus Organizer 5 File
.or6DataLotus Organizer 6 File
.oraDatabaseOracle Database Configuration File
.orcAudioVoyetra Digital Orchestrator File
.orderedtestDeveloperVisual Studio Ordered Test File
.orfRaster ImageOlympus RAW File
.orgDataLotus Organizer File
.oriBackupOriginal File
.origBackupOriginal File
.ortTextRich Text Editor Document
.orxDatabaseRadiantOne VDS Database Schema
.osDeveloperObjectScript Source File
.osaxPluginAppleScript Scripting Addition
.osbGISOpenStreetMap Binary Map File
.oscGISOpenStreetMap Change File
.osdxSettingsSearch Connector Description File
.osmGISOpenStreetMap Map File
.ospVideoOpenShot Project File
.osrGameOsu! Replay File
.ossSettingsMicrosoft Outlook Saved Search File
.ostMiscOutlook Offline Folder File
.osxExecutablePowerPC Executable File
.oszGameOsu! Beatmap File
.otaRaster ImageOTA Bitmap Image
.otbRaster ImageNokia Over The Air Bitmap Image
.otcMiscOpenDocument Chart Template
.otfDataOpenTuft Tufting Design File
.otfFontOpenType Font
.otfMiscOpenDocument Formula Template
.otgVector ImageOpenDocument Graphic Template
.othWebOpenDocument HTML Template
.otiRaster ImageOpenDocument Image Template
.otlDataNoteTab Outline File
.otlnDataOpal Outline File
.otmExecutableOutlook Macro File
.otpDataOpenDocument Presentation Template
.otsAudioOtsAV Album File
.otsSpreadsheetOpenDocument Spreadsheet Template
.ottTextOpenDocument Document Template
.outExecutableCompiled Executable File
.outDataOutput File
.ov2GISTomTom Points of Interest Database
.ovaDataOpen Virtual Appliance
.ovaDataOctava Musical Score
.oveAudioOverture Musical Score
.ovfDataOpen Virtualization File
.ovlGameRollercoaster Tycoon 3 Data File
.ovpVector ImageThe Overlay Maker Package File
.ovpnSettingsOpenVPN Configuration File
.ovrVector ImageThe Overlay Maker Overlay File
.ovwAudioCubase WAVE Overview File
.ovwAudioLogic Pro Overview File
.owDeveloperFree Pascal 1.0.x Object File
.owcDatabaseOutWit Catch Database
.owgMiscOutWit Gear Database
.owlDeveloperOWL Source Code File
.owmMiscOutWit XML Mashup File
.oxtPluginOpenOffice.org Extension
.oxygeneDeveloperOxygene Project File
.oyxBackupApproach Alternate Database Index
.ozCompressedOpera Job Management Compressed File