File Formats That Start with the Letter O

Explore a complete list of file formats that begin with the letter O, powered by the FileProInfo file type database. View file extensions, software compatibility, and metadata—and access 100% free online tools to convert, view, edit, compare, and manage your files instantly.

File Extension File Type Free Apps
.O Compiled Object File Free Online .O File Apps
.OA2 Fujitsu Oasys Free Online .OA2 File Apps
.OA3 Fujitsu Oasys Free Online .OA3 File Apps
.OAB Offline Address Book Free Online .OAB File Apps
.OAM Adobe Edge Animate Widget File Free Online .OAM File Apps
.OAP OutSystems Application Package Free Online .OAP File Apps
.OAR OpenSimulator Archive Free Online .OAR File Apps
.OAS Fujitsu Oasys Free Online .OAS File Apps
.OAT Android Optimized Application File Free Online .OAT File Apps
.OB! Orbit Downloader Incomplete Download Free Online .OB! File Apps
.OB2 Oberon-2 Source Code File Free Online .OB2 File Apps
.OBB Android Opaque Binary Blob File Free Online .OBB File Apps
.OBD Office Binder Document Free Online .OBD File Apps
.OBF OsmAnd Offline Map File Free Online .OBF File Apps
.OBI Outlook RSS Subscription File Free Online .OBI File Apps
.OBJ Relocatable Object Code Free Online .OBJ File Apps
.OBJ Wavefront 3D Object File Free Online .OBJ File Apps
.OBK Backup File Free Online .OBK File Apps
.OBML Opera Mini Saved Web Page Free Online .OBML File Apps
.OBML15 Opera Mini Saved Web Page Free Online .OBML15 File Apps
.OBML16 Opera Mini Saved Web Page Free Online .OBML16 File Apps
.OBP Bryce Object File Free Online .OBP File Apps
.OBT Openbox Theme File Free Online .OBT File Apps
.OBW Superior Drummer Sounds File Free Online .OBW File Apps
.OBZ Compressed 3D Object File Free Online .OBZ File Apps
.OC3 openCanvas 3 Event File Free Online .OC3 File Apps
.OC4 openCanvas 4 Event File Free Online .OC4 File Apps
.OC5 openCanvas 5 Event File Free Online .OC5 File Apps
.OCA Custom Control Library Type File Free Online .OCA File Apps
.OCC Oceanic DataPool File Free Online .OCC File Apps
.OCD OCAD Map File Free Online .OCD File Apps
.OCE Open Catalog Extension Connection File Free Online .OCE File Apps
.OCI openCanvas Image Free Online .OCI File Apps
.OCIMF OCIMF HVPQ File Free Online .OCIMF File Apps
.OCR FAXGrapper Fax Text File Free Online .OCR File Apps
.OCR Subtitle Workshop OCR Script Free Online .OCR File Apps
.OCT Radiance Octree File Free Online .OCT File Apps
.OCTEST Xcode Objective-C Unit Test Bundle Free Online .OCTEST File Apps
.OCX ActiveX Control Free Online .OCX File Apps
.OD Mascopt Graph Request File Free Online .OD File Apps
.ODA Office Document Architecture Free Online .ODA File Apps
.ODB OpenDocument Database Free Online .ODB File Apps
.ODB ABAQUS Database Free Online .ODB File Apps
.ODC OpenDocument Chart File Free Online .ODC File Apps
.ODC Office Data Connection File Free Online .ODC File Apps
.ODEX Optimized Dalvik Executable Free Online .ODEX File Apps
.ODF OpenDocument Formula Free Online .ODF File Apps
.ODF Battlezone Object Definition File Free Online .ODF File Apps
.ODF Open Document File Free Online .ODF File Apps
.ODFT OpenDocument Formula Template Free Online .ODFT File Apps
.ODG OpenDocument Graphic File Free Online .ODG File Apps
.ODI OpenDocument Image Free Online .ODI File Apps
.ODIF Open Document Interchange Format Free Online .ODIF File Apps
.ODIN Locky Ransomware Encrypted File Free Online .ODIN File Apps
.ODL Object Description Language File Free Online .ODL File Apps
.ODM OpenDocument Master Document Free Online .ODM File Apps
.ODM OverDrive Media File Free Online .ODM File Apps
.ODO Online Operating System Write Document Free Online .ODO File Apps
.ODP OpenDocument Presentation Free Online .ODP File Apps
.ODS Outlook Express 5 Mailbox Free Online .ODS File Apps
.ODS OpenDocument Spreadsheet Free Online .ODS File Apps
.ODT Origin Dialog Theme File Free Online .ODT File Apps
.ODT OpenDocument Text Document Free Online .ODT File Apps
.ODT OOMMF Data Table File Free Online .ODT File Apps
.ODTTF Obfuscated OpenType Font Free Online .ODTTF File Apps
.ODX BizTalk Server Orchestration File Free Online .ODX File Apps
.OEACCOUNT Windows Mail Account File Free Online .OEACCOUNT File Apps
.OEB Open eBook File Free Online .OEB File Apps
.OEB Outlook Express Backup Wizard File Free Online .OEB File Apps
.OEBZIP Zipped Open eBook File Free Online .OEBZIP File Apps
.OEM OEMEdit Save File Free Online .OEM File Apps
.OEM OEM Setup File Free Online .OEM File Apps
.OEX Opera Extension Free Online .OEX File Apps
.OFC Open Financial Connectivity File Free Online .OFC File Apps
.OFD OfficeForms Document Free Online .OFD File Apps
.OFF Object File Format Free Online .OFF File Apps
.OFFICEUI Microsoft Office UI Customization File Free Online .OFFICEUI File Apps
.OFL Ots File List Free Online .OFL File Apps
.OFM Melco Embroidery File Free Online .OFM File Apps
.OFM OmniForm Form Free Online .OFM File Apps
.OFP Origin Function Plot Theme File Free Online .OFP File Apps
.OFR SMS Offer Manager File Free Online .OFR File Apps
.OFR OptimFROG Audio File Free Online .OFR File Apps
.OFT Outlook File Template Free Online .OFT File Apps
.OFX Open Financial Exchange File Free Online .OFX File Apps
.OGA Ogg Vorbis Audio File Free Online .OGA File Apps
.OGF S.T.A.L.K.E.R. Model File Free Online .OGF File Apps
.OGG Ogg Vorbis Audio File Free Online .OGG File Apps
.OGG Origin Graph File Free Online .OGG File Apps
.OGGSTR Godot Engine Ogg Audio File Free Online .OGGSTR File Apps
.OGGU Origin Unicode Graph File Free Online .OGGU File Apps
.OGM Origin Matrix File Free Online .OGM File Apps
.OGM Ogg Media File Free Online .OGM File Apps
.OGMU Origin Unicode Matrix File Free Online .OGMU File Apps
.OGNC Dynamic Web Page Free Online .OGNC File Apps
.OGS Origons Movie Data File Free Online .OGS File Apps
.OGS Origin LabTalk Script File Free Online .OGS File Apps
.OGV Ogg Video File Free Online .OGV File Apps
.OGW Origin Workbook File Free Online .OGW File Apps
.OGWU Origin Unicode Workbook File Free Online .OGWU File Apps
.OGX Ogg Vorbis Multiplexed Media File Free Online .OGX File Apps
.OGZ Cube 2 Map File Free Online .OGZ File Apps
.OIF Origin Import Filter File Free Online .OIF File Apps
.OIS Origin Analyses Theme File Free Online .OIS File Apps
.OIV OpenIV Mod Package File Free Online .OIV File Apps
.OKT Oktalyzer Module Free Online .OKT File Apps
.OL Valve Hammer Object Layout File Free Online .OL File Apps
.OLA Online Access File Free Online .OLA File Apps
.OLB OLE Object Library Free Online .OLB File Apps
.OLB OrCAD Symbol Library File Free Online .OLB File Apps
.OLD Backup File Free Online .OLD File Apps
.OLK Outlook Address Book File Free Online .OLK File Apps
.OLK14EVENT Outlook Calendar Event File Free Online .OLK14EVENT File Apps
.OLK14GROUP Outlook Group File Free Online .OLK14GROUP File Apps
.OLK14MAILACCOUNT Outlook Mail Account File Free Online .OLK14MAILACCOUNT File Apps
.OLK14MESSAGE Outlook Message File Free Online .OLK14MESSAGE File Apps
.OLK14MSGATTACH Outlook 2011 Email Message Attachment File Free Online .OLK14MSGATTACH File Apps
.OLK14MSGSOURCE Outlook Email Message Data File Free Online .OLK14MSGSOURCE File Apps
.OLK14NOTE Outlook Note File Free Online .OLK14NOTE File Apps
.OLK14PREF Outlook Preferences File Free Online .OLK14PREF File Apps
.OLK14SIGNATURE Outlook Signature File Free Online .OLK14SIGNATURE File Apps
.OLK14TASK Outlook Task File Free Online .OLK14TASK File Apps
.OLK15MSGATTACH Outlook 2016 Email Message Attachment File Free Online .OLK15MSGATTACH File Apps
.OLL TrialDirector Object Load List Free Online .OLL File Apps
.OLM Mac Outlook Database File Free Online .OLM File Apps
.OLP Office Live Package Free Online .OLP File Apps
.OLT Orbit Downloads List Free Online .OLT File Apps
.OMA Sony OpenMG Music File Free Online .OMA File Apps
.OMCS Office Manager Access File Free Online .OMCS File Apps
.OMF Open Media Framework File Free Online .OMF File Apps
.OMF OMF Interchange Image File Free Online .OMF File Apps
.OMG Image File Free Online .OMG File Apps
.OMG OpenMG Audio File Free Online .OMG File Apps
.OML OutSystems Modeling Language File Free Online .OML File Apps
.OMO OMake Object File Free Online .OMO File Apps
.OMOD Oblivion Mod Archive Free Online .OMOD File Apps
.OMP Office Manager Document Archive Free Online .OMP File Apps
.OMP OpenMind Windows Document Free Online .OMP File Apps
.OMS HP Printer Substrate Presets Package File Free Online .OMS File Apps
.OMX OtsAV Media Library Information File Free Online .OMX File Apps
.OND Lotus Notes Encapsulated Memo File Free Online .OND File Apps
.ONE OneNote Document Free Online .ONE File Apps
.ONEPKG Microsoft OneNote Package File Free Online .ONEPKG File Apps
.ONETOC Microsoft OneNote Table of Contents File Free Online .ONETOC File Apps
.ONETOC2 Microsoft OneNote Table of Contents File Free Online .ONETOC2 File Apps
.ONT theWord Bible Text Module Free Online .ONT File Apps
.ONTX theWord Encrypted Bible Text Module Free Online .ONTX File Apps
.OO3 OmniOutliner 3 File Free Online .OO3 File Apps
.OO3TEMPLATE OmniOutliner Template Free Online .OO3TEMPLATE File Apps
.OOK Arachne Batch Script Free Online .OOK File Apps
.OP OpenPAT Report Free Online .OP File Apps
.OP2 Nastran Output File Free Online .OP2 File Apps
.OP4 Nastran Output File Free Online .OP4 File Apps
.OPAL Microsoft Office User Settings File Free Online .OPAL File Apps
.OPAX Microsoft Office User Settings File Free Online .OPAX File Apps
.OPD Durango Document Free Online .OPD File Apps
.OPD OmniPage Document Free Online .OPD File Apps
.OPDOWNLOAD Opera Partially Downloaded File Free Online .OPDOWNLOAD File Apps
.OPEICO Opeico Text File Free Online .OPEICO File Apps
.OPENBSD OpenBSD Readme File Free Online .OPENBSD File Apps
.OPF FlipAlbum File Free Online .OPF File Apps
.OPF FlipViewer FlipBook File Free Online .OPF File Apps
.OPF Open Packaging Format File Free Online .OPF File Apps
.OPJ OrCAD Project File Free Online .OPJ File Apps
.OPJ Origin Project Free Online .OPJ File Apps
.OPJU Origin Unicode Project Free Online .OPJU File Apps
.OPK GCW Zero Open Package Free Online .OPK File Apps
.OPLC Nokia Operator Logo File Free Online .OPLC File Apps
.OPML Outline Processor Markup Language File Free Online .OPML File Apps
.OPS Office Profile Settings File Free Online .OPS File Apps
.OPT Options File Free Online .OPT File Apps
.OPT AGT Game Data File Free Online .OPT File Apps
.OPT Opterecenja File Free Online .OPT File Apps
.OPTIONS SE-SOFT Configuration File Free Online .OPTIONS File Apps
.OPTS Linux Configuration Options File Free Online .OPTS File Apps
.OPUS Opus Audio File Free Online .OPUS File Apps
.OPX FlipAlbum Photo Album File Free Online .OPX File Apps
.OPX OrgPlus Org Chart Free Online .OPX File Apps
.OQY Excel OLAP Query File Free Online .OQY File Apps
.OR2 Lotus Organizer 2 File Free Online .OR2 File Apps
.OR3 IBM Lotus Organizer 97 File Free Online .OR3 File Apps
.OR4 IBM Lotus Organizer 97 GS File Free Online .OR4 File Apps
.OR5 Lotus Organizer 5 File Free Online .OR5 File Apps
.OR6 Lotus Organizer 6 File Free Online .OR6 File Apps
.ORA OpenRaster Image File Free Online .ORA File Apps
.ORA Oracle Database Configuration File Free Online .ORA File Apps
.ORB Original eBook Reader File Free Online .ORB File Apps
.ORC Voyetra Digital Orchestrator File Free Online .ORC File Apps
.ORDEREDTEST Visual Studio Ordered Test File Free Online .ORDEREDTEST File Apps
.ORE Ore Executable File Free Online .ORE File Apps
.ORF Olympus RAW File Free Online .ORF File Apps
.ORG Lotus Organizer File Free Online .ORG File Apps
.ORI Original File Free Online .ORI File Apps
.ORIG Original File Free Online .ORIG File Apps
.ORT Rich Text Editor Document Free Online .ORT File Apps
.ORV Oracom Video File Free Online .ORV File Apps
.ORX RadiantOne VDS Database Schema Free Online .ORX File Apps
.OS ObjectScript Source File Free Online .OS File Apps
.OSAX AppleScript Scripting Addition Free Online .OSAX File Apps
.OSB Osu! Storyboard File Free Online .OSB File Apps
.OSB OpenStreetMap Binary Map File Free Online .OSB File Apps
.OSC OpenStreetMap Change File Free Online .OSC File Apps
.OSC Obix Source Code File Free Online .OSC File Apps
.OSDX Search Connector Description File Free Online .OSDX File Apps
.OSF Open Score Free Online .OSF File Apps
.OSFPVG OSFPVG Free Online .OSFPVG File Apps
.OSK osu! Skin File Free Online .OSK File Apps
.OSM OpenStreetMap Map File Free Online .OSM File Apps
.OSP OpenShot Project File Free Online .OSP File Apps
.OSR osu! Replay File Free Online .OSR File Apps
.OSS Microsoft Outlook Saved Search File Free Online .OSS File Apps
.OST Outlook Offline Data File Free Online .OST File Apps
.OSU Osu! Script Free Online .OSU File Apps
.OSX PowerPC Executable File Free Online .OSX File Apps
.OSZ osu! Beatmap File Free Online .OSZ File Apps
.OSZ OpenLP Service File Free Online .OSZ File Apps
.OT theWord Old Testament Text Module Free Online .OT File Apps
.OTA OTA Ringtone File Free Online .OTA File Apps
.OTA OTA Bitmap Image Free Online .OTA File Apps
.OTB Nokia Over The Air Bitmap Image Free Online .OTB File Apps
.OTC OpenDocument Chart Template Free Online .OTC File Apps
.OTF OpenTuft Tufting Design File Free Online .OTF File Apps
.OTF OpenDocument Formula Template Free Online .OTF File Apps
.OTF OpenType Font Free Online .OTF File Apps
.OTG OpenDocument Graphic Template Free Online .OTG File Apps
.OTH Origin Graph Theme File Free Online .OTH File Apps
.OTH OpenDocument HTML Template Free Online .OTH File Apps
.OTI OpenDocument Image Template Free Online .OTI File Apps
.OTL NoteTab Outline File Free Online .OTL File Apps
.OTLN Opal Outline File Free Online .OTLN File Apps
.OTM Origin Matrix Template Free Online .OTM File Apps
.OTM Outlook Macro File Free Online .OTM File Apps
.OTMU Origin Unicode Matrix Template Free Online .OTMU File Apps
.OTP OpenDocument Presentation Template Free Online .OTP File Apps
.OTP Origin Graph Template Free Online .OTP File Apps
.OTPU Origin Unicode Graph Template Free Online .OTPU File Apps
.OTRKEY OnlineTvRecorder Encoded Video File Free Online .OTRKEY File Apps
.OTS OtsAV Album File Free Online .OTS File Apps
.OTS OpenDocument Spreadsheet Template Free Online .OTS File Apps
.OTT OpenDocument Document Template Free Online .OTT File Apps
.OTW Origin Workbook Template Free Online .OTW File Apps
.OTWU Origin Unicode Workbook Template Free Online .OTWU File Apps
.OTX theWord Encrypted Old Testament Text Module Free Online .OTX File Apps
.OTZ OpenLP Theme File Free Online .OTZ File Apps
.OUT Output File Free Online .OUT File Apps
.OV2 TomTom Points of Interest Database Free Online .OV2 File Apps
.OVA Octava Musical Score Free Online .OVA File Apps
.OVA Open Virtual Appliance Free Online .OVA File Apps
.OVE Overture Musical Score Free Online .OVE File Apps
.OVF Open Virtualization File Free Online .OVF File Apps
.OVH OMSI Vehicle Configuration File Free Online .OVH File Apps
.OVL Rollercoaster Tycoon 3 Data File Free Online .OVL File Apps
.OVOLOG ooVoo Log File Free Online .OVOLOG File Apps
.OVP The Overlay Maker Package File Free Online .OVP File Apps
.OVPN OpenVPN Configuration File Free Online .OVPN File Apps
.OVR The Overlay Maker Overlay File Free Online .OVR File Apps
.OVW Cubase WAVE Overview File Free Online .OVW File Apps
.OVW Logic Pro Overview File Free Online .OVW File Apps
.OVX Object-based Visual Application Language File Free Online .OVX File Apps
.OW Free Pascal 1.0.x Object File Free Online .OW File Apps
.OWC OutWit Catch Database Free Online .OWC File Apps
.OWG OutWit Gear Database Free Online .OWG File Apps
.OWL OWL Source Code File Free Online .OWL File Apps
.OWM OutWit XML Mashup File Free Online .OWM File Apps
.OWX OutWit Hub Automator File Free Online .OWX File Apps
.OXPS OpenXPS File Free Online .OXPS File Apps
.OXT Apache OpenOffice Extension Free Online .OXT File Apps
.OXYGENE Oxygene Project File Free Online .OXYGENE File Apps
.OYX Approach Alternate Database Index Free Online .OYX File Apps
.OZ Opera Job Management Compressed File Free Online .OZ File Apps
.OZB MU Online Image File Free Online .OZB File Apps
.OZJ MU Online Image File Free Online .OZJ File Apps
.OZT MU Online Image File Free Online .OZT File Apps
Extension File Type Free Apps

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