All File Extension Names Start With o
TOTAL
Extensions

195

Total Extension Name
TOTAL
Type

221

Total Extension Type
Browse Extensions

All File Extensions That Start With The Letter O

Extension Name Extension Type Category Dev.Company File Format
.OTF File Extension OpenType Font Font N/A Unknown
.OTF File Extension OpenTuft Tufting Design File Data NedGraphics Text
.OTF File Extension OpenDocument Formula Template Misc Oracle Binary
.OBJ File Extension Wavefront 3D Object File 3D Image Wavefront Technologies Unknown
.OBJ File Extension Relocatable Object Code Data N/A Unknown
.OBI File Extension Outlook RSS Subscription File Settings Microsoft XML
.ODP File Extension OpenDocument Presentation Data Oracle Zip
.OSZ File Extension Osu! Beatmap File Game peppy Zip
.OSZ File Extension OpenLP Service File Data OpenLP Binary
.OUT File Extension Output File Data N/A Text
.OUT File Extension Compiled Executable File Executable N/A Binary
.ORA File Extension Oracle Database Configuration File Database Oracle Text
.OFX File Extension Open Financial Exchange File Data N/A Unknown
.OTRKEY File Extension OnlineTvRecorder Encoded Video File Video OnlineTvRecorder.com Binary
.OV2 File Extension TomTom Points of Interest Database GIS TomTom Unknown
.ODS File Extension OpenDocument Spreadsheet Spreadsheet Oracle Zip
.ODS File Extension Outlook Express 5 Mailbox Misc Microsoft Unknown
.OPML File Extension Outline Processor Markup Language File Web N/A XML
.ORIG File Extension Original File Backup N/A Text and Binary
.OSDX File Extension Search Connector Description File Settings Microsoft XML
.OMF File Extension Open Media Framework File Audio Avid Technology Binary
.OMF File Extension OMF Interchange Image File Raster Image N/A Unknown
.OPDOWNLOAD File Extension Opera Partially Downloaded File Misc Opera Software Text and Binary
.OGG File Extension Ogg Vorbis Audio File Audio Xiph.Org Binary
.OLD File Extension Backup File Backup N/A Unknown
.OEACCOUNT File Extension Windows Mail Account File Data Microsoft XML
.OVF File Extension Open Virtualization File Data VMware Binary
.OGF File Extension S.T.A.L.K.E.R. Model File 3D Image GSC Game World Binary
.OBD File Extension Office Binder Document Data Microsoft Binary
.OST File Extension Outlook Offline Folder File Misc Microsoft Binary
.ONEPKG File Extension Microsoft OneNote Package File Backup Microsoft Unknown
.OGA File Extension Ogg Vorbis Audio File Audio Xiph.Org Binary
.OTL File Extension NoteTab Outline File Data Fookes Software Unknown
.OC4 File Extension openCanvas 4 Event File Raster Image Portalgraphics Binary
.OSC File Extension OpenStreetMap Change File GIS OpenStreetMap Text
.OSC File Extension Obix Source Code File Developer N/A Text
.OVA File Extension Open Virtual Appliance Data VMware Binary
.OVA File Extension Octava Musical Score Data Obtiv Unknown
.OBML File Extension Opera Mini Saved Web Page Web Opera Software Binary
.OXT File Extension Apache OpenOffice Extension Plugin Sun Microsystems Zip
.OEM File Extension OEM Setup File Settings Microsoft Text
.OEM File Extension OEMEdit Save File Data McSherry Hardware UK Unknown
.OR6 File Extension Lotus Organizer 6 File Data IBM Unknown
.OMP File Extension OpenMind Windows Document Page Layout MatchWare Unknown
.OMP File Extension Office Manager Document Archive Data Krekeler Unknown
.OGX File Extension Ogg Vorbis Multiplexed Media File Video Xiph.Org Unknown
.ODB File Extension OpenDocument Database Database OASIS Zip
.ODB File Extension ABAQUS Database Database N/A Unknown
.ODC File Extension Office Data Connection File Settings Microsoft Text
.ODC File Extension OpenDocument Chart File Data OASIS Binary
.OPF File Extension FlipViewer FlipBook File Data E-Book Systems XML
.OPF File Extension Open Packaging Format File eBook IDPF XML
.OSS File Extension Microsoft Outlook Saved Search File Settings Microsoft Binary
.ONETOC2 File Extension Microsoft OneNote Table of Contents File Settings Microsoft Binary
.OVW File Extension Logic Pro Overview File Audio Apple Binary
.OVW File Extension Cubase WAVE Overview File Audio Steinberg Media Technologies Binary
.OCT File Extension Radiance Octree File 3D Image Radiance Binary
.OSK File Extension Osu! Skin File Game peppy Zip
.OBB File Extension Android Opaque Binary Blob File Data Google Binary
.OBW File Extension Superior Drummer Sounds File Audio Toontrack Binary
.OZB File Extension MU Online Image File Raster Image Webzen Binary
.OL File Extension Valve Hammer Object Layout File 3D Image Valve Unknown
.OLP File Extension Office Live Package Web Microsoft Unknown
.OIV File Extension OpenIV Mod Package File Plugin RAGE Research project Unknown
.ODTTF File Extension Obfuscated OpenType Font Font N/A Unknown
.OCD File Extension OCAD Map File GIS OCAD Binary
.ODL File Extension Object Description Language File Developer Microsoft Text
.OAM File Extension Adobe Edge Animate Widget File Web Adobe Systems Zip
.OQY File Extension Excel OLAP Query File Database Microsoft Unknown
.OCTEST File Extension Xcode Objective-C Unit Test Bundle Developer Apple Binary
.OPJ File Extension OrCAD Project File CAD Cadence Design Systems Text
.OMOD File Extension Oblivion Mod Archive Game N/A Binary
.OSR File Extension Osu! Replay File Game peppy Binary
.ONT File Extension theWord Bible Text Module Data theWord Bible Software Text
.OT File Extension theWord Old Testament Text Module Data theWord Bible Software Text
.ONTX File Extension theWord Encrypted Bible Text Module Data theWord Bible Software Binary
.OTX File Extension theWord Encrypted Old Testament Text Module Data theWord Bible Software Binary
.OC5 File Extension openCanvas 5 Event File Raster Image Portalgraphics Binary
.OCI File Extension openCanvas Image Raster Image Portalgraphics Binary
.OC3 File Extension openCanvas 3 Event File Raster Image Portalgraphics Binary
.OFM File Extension OmniForm Form Data Nuance Communications Unknown
.OWL File Extension OWL Source Code File Developer N/A Unknown
.OPX File Extension FlipAlbum Photo Album File Data E-Book Systems Unknown
.OPX File Extension OrgPlus Org Chart Data Insperity Business Services Unknown
.OTS File Extension OpenDocument Spreadsheet Template Spreadsheet OASIS Binary
.OTS File Extension OtsAV Album File Audio Ots Labs Unknown
.OTH File Extension OpenDocument HTML Template Web OASIS Binary
.OGNC File Extension Dynamic Web Page Web N/A Unknown
.OTP File Extension OpenDocument Presentation Template Data OASIS Binary
.ODF File Extension OpenDocument Formula Misc Oracle Zip
.ODF File Extension Battlezone Object Definition File Game Activision Text
.ODF File Extension Open Document File Data OASIS Zip
.ODG File Extension OpenDocument Graphic File Vector Image OASIS Zip
.OCA File Extension Custom Control Library Type File Developer Microsoft Unknown
.ODX File Extension BizTalk Server Orchestration File Data Microsoft Unknown
.ODEX File Extension Optimized Dalvik Executable System N/A Binary
.OTA File Extension OTA Bitmap Image Raster Image Nokia Text and Binary
.OAB File Extension Offline Address Book Data N/A Unknown
.OYX File Extension Approach Alternate Database Index Backup N/A Unknown
.OKT File Extension Oktalyzer Module Audio N/A Unknown
.OVE File Extension Overture Musical Score Audio GenieSoft Unknown
.O File Extension Compiled Object File Developer N/A Unknown
.OTLN File Extension Opal Outline File Data A Sharp Unknown
.OO3 File Extension OmniOutliner 3 File Data The Omni Group Unknown
.OMO File Extension OMake Object File Developer OMake Unknown
.OLA File Extension Online Access File Page Layout N/A Unknown
.ODM File Extension OpenDocument Master Document Text OASIS Binary
.ODM File Extension OverDrive Media File Audio OverDrive Unknown
.ONE File Extension OneNote Document Data Microsoft Unknown
.OND File Extension Lotus Notes Encapsulated Memo File Data IBM Unknown
.OMX File Extension OtsAV Media Library Information File Audio Ots Labs Unknown
.OVPN File Extension OpenVPN Configuration File Settings OpenVPN Technologies Unknown
.ORI File Extension Original File Backup N/A Unknown
.OLB File Extension OLE Object Library Misc Microsoft Binary
.OLB File Extension OrCAD Symbol Library File CAD Cadence Design Systems Binary
.OFT File Extension Outlook File Template Data Microsoft Unknown
.OEB File Extension Outlook Express Backup Wizard File Backup QSX Binary
.OEB File Extension Open eBook File eBook IDPF Binary
.OFL File Extension Ots File List Text Ots Labs Unknown
.OPT File Extension Options File Settings N/A Unknown
.OPT File Extension Opterecenja File CAD Zeljko Finzgar Unknown
.OB! File Extension Orbit Downloader Incomplete Download Misc Orbit Downloader Unknown
.OFC File Extension Open Financial Connectivity File Data Microsoft Unknown
.OPS File Extension Office Profile Settings File Settings Microsoft Unknown
.OPD File Extension OmniPage Document Page Layout Nuance Communications Unknown
.OPD File Extension Durango Document Data Diffraction International Unknown
.OVOLOG File Extension ooVoo Log File Data ooVoo Unknown
.OP4 File Extension Nastran Output File Data MSC Software Unknown
.OCR File Extension Subtitle Workshop OCR Script Misc URUSoft Text
.OCR File Extension FAXGrapper Fax Text File Text Nuance Communications Text
.OTZ File Extension OpenLP Theme File Settings OpenLP Binary
.OLT File Extension Orbit Downloads List Data Orbit Downloader Unknown
.OXYGENE File Extension Oxygene Project File Developer RemObjects XML
.OLL File Extension TrialDirector Object Load List Data inData Text
.OBT File Extension Openbox Theme File Settings Openbox Binary
.OEBZIP File Extension Zipped Open eBook File eBook IDPF Zip
.OS File Extension ObjectScript Source File Developer ObjectScript Text
.OPUS File Extension Opus Audio File Audio Xiph.Org Binary
.OZT File Extension MU Online Image File Raster Image Webzen Binary
.OSU File Extension Osu! Script Game peppy Text
.OTG File Extension OpenDocument Graphic Template Vector Image OASIS Binary
.ORG File Extension Lotus Organizer File Data N/A Unknown
.ORX File Extension RadiantOne VDS Database Schema Database Radiant Logic XML
.OZJ File Extension MU Online Image File Raster Image Webzen Binary
.OP2 File Extension Nastran Output File Data MSC Software Binary
.OXPS File Extension OpenXPS File Page Layout Microsoft Binary
.ODI File Extension OpenDocument Image Raster Image OASIS Zip
.OPAL File Extension Microsoft Office User Settings File Data Microsoft Text
.OWC File Extension OutWit Catch Database Database OutWit Technologies Unknown
.ORDEREDTEST File Extension Visual Studio Ordered Test File Developer Microsoft XML
.OPTS File Extension Linux Configuration Options File Settings N/A Text
.OZ File Extension Opera Job Management Compressed File Compressed Opera Company Binary
.OSP File Extension OpenShot Project File Video Jonathan Thomas Binary
.OEX File Extension Opera Extension Plugin Opera Software Binary
.OSAX File Extension AppleScript Scripting Addition Plugin Apple Binary
.OBP File Extension Bryce Object File 3D Image DAZ Productions Binary
.OVL File Extension Rollercoaster Tycoon 3 Data File Game Atari Binary
.OLK14NOTE File Extension Outlook Note File Data Microsoft Binary
.OGZ File Extension Cube 2 Map File Game Wouter van Oortmerssen Binary
.OWG File Extension OutWit Gear Database Misc OutWit Technologies Unknown
.OMCS File Extension Office Manager Access File Data Krekeler Unknown
.OR4 File Extension IBM Lotus Organizer 97 GS File Data IBM Unknown
.OR5 File Extension Lotus Organizer 5 File Data IBM Unknown
.OCE File Extension Open Catalog Extension Connection File Settings Oracle Unknown
.OPAX File Extension Microsoft Office User Settings File Data Microsoft Text
.OAR File Extension OpenSimulator Archive Compressed N/A Binary
.OBZ File Extension Compressed 3D Object File 3D Image Smith Micro Binary
.OLK File Extension Outlook Address Book File Data Microsoft Binary
.OSB File Extension OpenStreetMap Binary Map File GIS Merkaartor Binary
.OVR File Extension The Overlay Maker Overlay File Vector Image The Overlay Maker Binary
.OVP File Extension The Overlay Maker Package File Vector Image The Overlay Maker Zip
.OWM File Extension OutWit XML Mashup File Misc OutWit Technologies XML
.OLK14SIGNATURE File Extension Outlook Signature File Data Microsoft Binary
.OFR File Extension OptimFROG Audio File Audio OptimFROG Binary
.OTB File Extension Nokia Over The Air Bitmap Image Raster Image Nokia Binary
.OLK14MSGSOURCE File Extension Outlook Email Message Data File Data Microsoft Binary
.OLK14CONTACT File Extension Outlook Contact File Data Microsoft Binary
.OLK14GROUP File Extension Outlook Group File Data Microsoft Unknown
.OLK14CATEGORY File Extension Outlook Category File Data Microsoft Binary
.OLK14EVENT File Extension Outlook Calendar Event File Data Microsoft Binary
.OLK14MAILACCOUNT File Extension Outlook Mail Account File Data Microsoft Binary
.ORE File Extension Ore Executable File Executable crait Unknown
.OSX File Extension PowerPC Executable File Executable N/A Unknown
.OGS File Extension Origons Movie Data File Data Origons Unknown
.OR3 File Extension IBM Lotus Organizer 97 File Data IBM Unknown
.OR2 File Extension Lotus Organizer 2 File Data IBM Unknown
.OW File Extension Free Pascal 1.0.x Object File Developer Free Pascal Binary
.OPENBSD File Extension OpenBSD Readme File Text N/A Unknown
.ORC File Extension Voyetra Digital Orchestrator File Audio Voyetra Unknown
.OOK File Extension Arachne Batch Script Misc Arachne Text
.ORV File Extension Oracom Video File Video Oracom Binary
.OD File Extension Mascopt Graph Request File Data INRIA/UNSA Text
.ODIF File Extension Open Document Interchange Format Text ITU-T Binary
.OLK14PREF File Extension Outlook Preferences File Settings Microsoft Binary
.ODO File Extension Online Operating System Write Document Text iCUBE Network Solutions Text
.OLK14TASK File Extension Outlook Task File Data Microsoft Binary
.ODT File Extension OpenDocument Text Document Text Oracle Zip
.OSM File Extension OpenStreetMap Map File GIS OpenStreetMap XML
.OCX File Extension ActiveX Control Developer Microsoft Binary
.OMG File Extension OpenMG Audio File Audio Sony Unknown
.OMG File Extension Image File Disk Image O&O Software Unknown
.OBK File Extension Backup File Backup O&O Software Unknown
.OGV File Extension Ogg Video File Video Xiph.Org Binary
.OLK14MESSAGE File Extension Outlook Message File Data Microsoft Binary
.OTM File Extension Outlook Macro File Executable Microsoft Text
.OLM File Extension Mac Outlook Database File Data Microsoft Binary
.OPLC File Extension Nokia Operator Logo File Raster Image Nokia Binary
.OVH File Extension OMSI Vehicle Configuration File Game MR Software Text
.OFFICEUI File Extension Microsoft Office UI Customization File Settings Microsoft XML
.OWX File Extension OutWit Hub Automator File Data OutWit Technologies Unknown
.OTT File Extension OpenDocument Document Template Text OASIS Binary
.OFF File Extension Object File Format 3D Image N/A Text
.ORF File Extension Olympus RAW File Camera Raw Olympus Binary
.OGM File Extension Ogg Media File Video N/A Binary
.OMA File Extension Sony OpenMG Music File Audio Sony Unknown
.OP File Extension OpenPAT Report Data N/A Text
.OTI File Extension OpenDocument Image Template Raster Image OASIS Zip
.OTC File Extension OpenDocument Chart Template Misc OASIS Zip
.OCC File Extension Oceanic DataPool File Data Oceanic Consulting Corporation Unknown
.ORT File Extension Rich Text Editor Document Text IBM Unknown
.OPTIONS File Extension SE-SOFT Configuration File Settings SE-SOFT XML


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