| .O |
Compiled Object File |
| .O01 |
Typhoon Voice |
| .O2C |
Objects To See 3D |
| .O2S |
Oracle to MySQL Converter data |
| .O3D |
Google Open 3D web graphic format |
| .O8D |
OCTGN Deck |
| .O8G |
OCTGN Game Definition |
| .O8O |
Mediator 5 Repository Tabs Vorlagen.006 |
| .O8S |
OCTGN Set |
| .OA |
OrCAD PCB Designer OpenAccess database |
| .OAB |
Microsoft Outlook offline address book file |
| .OAC |
Grand Theft Auto V audio data |
| .OAD |
Suite Notaro Document |
| .OAF |
Microsoft Flight Simulator Texture |
| .OAM |
Adobe Edge overlay file |
| .OAP |
Samsung Bada Signed Installation Package |
| .OAR |
HSQLDB database file |
| .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 file |
| .OB3 |
ABF Software Outlook Backup Backup |
| .OB5 |
TopLang OE Backup |
| .OBAK |
WinSQL Offline Backup |
| .OBB |
Android Opaque Binary Blob (APK Expansion File) |
| .OBD |
Microsoft Office Binder Document |
| .OBF |
OsmAnd Offline GPS Vector Maps |
| .OBG |
ZBrush Mesh |
| .OBI |
Outlook RSS Subscription File |
| .OBJ |
Wavefront OBJ (3D geometry) |
| .OBJECTION |
Objection.lol Project |
| .OBJX |
Metatools Object Bryce Support |
| .OBK |
OrCAD Capture Design Or Library |
| .OBL |
TrueSpace |
| .OBM |
EIAS camera motion export |
| .OBML |
Opera Mini saved web page file |
| .OBML15 |
Opera Mini 5.1 Saved Web Page |
| .OBML16 |
Opera Mini saved web page file |
| .OBP |
Bryce Object File |
| .OBPACK |
ObjectBar Theme Pack |
| .OBR |
Borland C++ Object Browser Data |
| .OBS |
WAsP Obstacle List |
| .OBS-SERVICE |
Open Broadcaster Software data |
| .OBSKIN |
ObjectBar skin |
| .OBT |
Microsoft Office Binder template file |
| .OBV |
3D Photo Browser Thumbnail Cache |
| .OBW |
Toontrack Superior Drummer audio file |
| .OBX |
Rational XDE |
| .OBYX |
Obyx Control |
| .OBZ |
Microsoft Office Binder wizard file |
| .OC_ |
Compressed ActiveX Control |
| .OC3 |
openCanvas 3 Event File |
| .OC4 |
openCanvas 4 Event File |
| .OC5 |
openCanvas 5 Event File |
| .OC9 |
OrgCon Organization |
| .OCA |
Visual Basic Control Typelib Cache file |
| .OCAMLMAKEFILE |
Caml Programming Language Makefile |
| .OCB |
Origin Precompiled Origin C |
| .OCC |
DB/TextWorks Terms and Words database file |
| .OCD |
OCAD Map File |
| .OCDC |
Mathematica Document |
| .OCDF |
OneClickDigital Mp3 Audio Book |
| .OCE |
Open Catalog extension connection file |
| .OCEN |
EdGCM Data |
| .OCF |
OM2 Cipher |
| .OCG |
Osprey Custom Graph |
| .OCI |
openCanvas image file |
| .OCL |
Object Constraint Language data |
| .OCM |
Netscape Communicator Aim |
| .OCO |
Open Color Format palette |
| .OCP |
Advanced Art Studio Image |
| .OCR |
FaxGrapper FAX transcribed text file |
| .OCREC |
Microsoft Lync data |
| .OCSP |
HAProxy OCSP data |
| .OCT |
RADIANCE Octree Format file |
| .OCTEST |
Xcode Objective-C Unit Test Bundle |
| .OCV |
OCV Training Data |
| .OCX |
ActiveX Control |
| .OD |
Mascotte Mascopt request file |
| .OD_ |
Oracle Compressed Driver |
| .OD1 |
Omnis 5 Database |
| .OD2 |
Omnis 5 Database |
| .OD3 |
Omnis Studio Database |
| .OD4-9 |
Omnis5 Database |
| .OD5 |
Omnis 5 database |
| .ODA |
CALS Group IV type 2 raster image |
| .ODB |
OpenDocument Database |
| .ODC |
Office Data Connection |
| .ODCCUBEFILE |
OpenDocument 1 |
| .ODCDATABASEFILE |
Microsoft Office data |
| .ODCNEWFILE |
Microsoft Office Data Connection |
| .ODCODC |
ODCODC ransomware affected file |
| .ODCTABLECOLLECTIONFILE |
Microsoft Office component |
| .ODCTABLEFILE |
Microsoft Office |
| .ODE |
Microsoft Office |
| .ODEX |
Google Android Optimized Executalbe |
| .ODF |
OpenDocument Formula |
| .ODG |
OpenDocument Graphics (Drawing) |
| .ODH |
Microsoft Visual Studio Interface Definition Language |
| .ODI |
OpenOffice.org image file |
| .ODIF |
Open Document Interchange Format file |
| .ODIN |
Locky Ransomware Encrypted File (.odin variant) |
| .ODL |
Visual C++ ODL type library source file |
| .ODM |
OpenOffice.org OpenDocument global text document file |
| .ODO |
iCUBE Online Operating System Write document file |
| .ODP |
OpenDocument Presentation |
| .ODR |
HMI Builder report |
| .ODS |
OpenDocument Spreadsheet |
| .ODT |
OpenDocument Text |
| .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 file |
| .OEACCAOUNT |
Windows Mail |
| .OEACCOUNT |
Windows Mail account settings file |
| .OEB |
Open eBook format |
| .OECL |
Open EDA Component Library |
| .OEF |
Optim Export |
| .OEM |
OEM install data file |
| .OEMIGACCOUNT |
Outlook Express Temporary |
| .OER |
AU OER TOOLS project |
| .OET |
ESignal Order Entry Ticket |
| .OETPL |
Offline Explorer file |
| .OEX |
Opera add-on file |
| .OFA |
Kodak OfotoNow |
| .OFB |
Oxygen Forensic Suite Backup |
| .OFC |
Open Financial Connectivity File |
| .OFD |
Open Fixed-layout Document |
| .OFF |
Object File Format (3D Mesh) |
| .OFFICEUI |
Microsoft Office UI Customization |
| .OFFSETS |
Offset |
| .OFL |
OtsTurntables playlist |
| .OFM |
Adobe PostScript font description file |
| .OFN |
MS Office File New (Other Office Documents) |
| .OFP |
Objecteering Project |
| .OFR |
OptimFROG encoded audio |
| .OFS |
OptimFROG Dualstream |
| .OFT |
Microsoft Outlook Template |
| .OFX |
Open Financial Exchange |
| .OGA |
Ogg Audio File |
| .OGD |
Oracle Forms Graph |
| .OGEX |
Open Game Engine Exchange data |
| .OGF |
OnkoS graphic file |
| .OGG |
Ogg Vorbis Audio File |
| .OGL |
ATI Overlay Source Code |
| .OGM |
Ogg Vorbis media file |
| .OGMO |
OGMO Editor 3 Project File |
| .OGNC |
Dynamic web page file |
| .OGO |
Origin Graphic Object |
| .OGR |
OGR C++ Open Source Library |
| .OGRE |
OGRE 3D data |
| .OGS |
Origin script file |
| .OGV |
Ogg Video |
| .OGW |
OriginLab Worksheet |
| .OGX |
Microsoft C++ Component Gallery exported classes and resources |
| .OGZ |
Cube 2 Sauerbraten map file |
| .OH |
DrillAssistant List |
| .OH4 |
Overhoor List |
| .OHP |
MS-DOS 7 |
| .OHS |
Bink Outbound History |
| .OHT |
Oracle Help for Java links data |
| .OHW |
Overhoor DrillAssistant List |
| .OIF |
QuickBase Web-sharable Database Interchange |
| .OIL |
Open Image Library Format Image Format |
| .OIV |
OpenIV mod archive |
| .OJP |
3WayPack |
| .OK |
Qedit |
| .OKD |
Lenovo OneKey Recovery data |
| .OKM |
OkMap Map Defining |
| .OKOZO |
Okozo Desktop Animation |
| .OKR |
PowerRecover One Key Recovery |
| .OKS |
OKScript |
| .OKT |
Oktalyzer music module (MOD) file |
| .OKX |
OKScript |
| .OL |
Valve Hammer Object Layout |
| .OLA |
Online Access File |
| .OLB |
OLE Object Library File |
| .OLB2 |
CanOpener Library |
| .OLD |
Backup / Old Version File |
| .OLE |
Microsoft Object Linking And Embedding |
| .OLE2 |
Microsoft Office Binary Document Container Format |
| .OLF |
OyezForms Legal Documents |
| .OLG |
Orbit legend data |
| .OLK |
Microsoft Outlook address book file |
| .OLK14 |
Microsoft Outlook for Mac message |
| .OLK14ARRANGE |
Microsoft Outlook 2011 for Mac data |
| .OLK14CALATTACH |
Microsoft Outlook 2011 for Mac data |
| .OLK14CATEGORY |
Microsoft Outlook 2011 for Mac category file |
| .OLK14CONTACT |
Microsoft Outlook 2011 for Mac contact file |
| .OLK14DBHEADER |
Microsoft Outlook 2011 For Mac Database |
| .OLK14EVENT |
Outlook Calendar Event File |
| .OLK14EXACCOUNT |
Microsoft Outlook 2011 for Mac data |
| .OLK14EXMOVES |
Microsoft Outlook 2011 for Mac data |
| .OLK14EXSYNCMAP |
Microsoft Outlook 2011 for Mac data |
| .OLK14FOLDER |
Microsoft Outlook 2011 For Mac Folder |
| .OLK14GROUP |
Outlook Group File |
| .OLK14IMAPSYNCMAP |
Microsoft Outlook 2011 for Mac data |
| .OLK14MAILACCOUNT |
Microsoft Outlook 2011 for Mac mail account settings file |
| .OLK14MESSAGE |
Microsoft Outlook 2011 for Mac message file |
| .OLK14MSGATTACH |
Microsoft Outlook 2011 For Mac Message Attachment |
| .OLK14MSGSOURCE |
Microsoft Outlook 2011 for Mac message source file |
| .OLK14NOTE |
Outlook Note File |
| .OLK14PREF |
Microsoft Outlook 2011 for Mac preferences file |
| .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 file |
| .OLK14TASK |
Outlook Task File |
| .OLK14UID |
Microsoft Outlook 2011 For Mac UID |
| .OLK15MESSAGE |
Microsoft Outlook for Mac message |
| .OLL |
TrialDirector Load |
| .OLM |
Outlook for Mac Data File |
| .OLN |
Microsoft Visual C++ Outline Examples |
| .OLPROJ |
Adobe OnLocation |
| .OLR |
Openlab RAW image |
| .OLS |
Microsoft Office List Shortcut |
| .OLT |
Orbit Downloader download list file |
| .OLV |
Roller Coaster Tycoon |
| .OLY |
AFP Advanced Function Presentation Overlay Resource |
| .OMA |
Sony OpenMG Audio File |
| .OMC |
Origin Customized Menu |
| .OMCS |
Office Manager Access File |
| .OMD |
MapInfo Routing J Server Data |
| .OME |
Open Microscopy Environment OME image |
| .OMEG |
Mathematica For Mac |
| .OMF |
Open Media Framework Interchange File |
| .OMFI |
Open Media Framework |
| .OMG |
O&O DiskImage backup file |
| .OMI |
Orbit multiresolution image |
| .OMK |
Ocera Make System script |
| .OML |
TracePro Model |
| .OMLOG |
CA OM Web Viewer log |
| .OMN |
Omnipotent Collection |
| .OMO |
OMake object file |
| .OMOD |
Oblivion Mod Manager mod file |
| .OMP |
OpenMind project file |
| .OMR |
OMR Template |
| .OMS |
Order Maven |
| .OMT |
SITH HLA Object Model Template |
| .OMU |
XWE data |
| .OMX |
OtsAV media library information file |
| .ON2 |
On2 Encoded FLV |
| .ONB |
OpenModelica document |
| .ONBATCH |
ON1 Photo data |
| .OND |
Lotus Notes file |
| .ONE |
Microsoft OneNote Section |
| .ONEBIN |
OneNote data |
| .ONECACHE |
Microsoft OneNote Cache |
| .ONEFFECTS |
Perfect Effects data |
| .ONENHANCE |
Perfect Effects data |
| .ONEPASSWORD-LICENSE |
1Password license |
| .ONEPKG |
Microsoft OneNote Package |
| .ONEPKG_1033 |
Microsoft update data |
| .ONETMP |
Microsoft OneNote Temporary |
| .ONETOC |
Microsoft OneNote Table Of Contents |
| .ONETOC2 |
Microsoft OneNote Table of Contents File |
| .ONEXPORT |
ON1 Photo data |
| .ONM |
Outdoor Navigator Map |
| .ONPORTRAIT |
ON1 Photo data |
| .ONPORTRAITFD |
Perfect Effects data |
| .ONPRESET |
Perfect Effects preset |
| .ONRESIZE |
Perfect Effects data |
| .ONT |
theWord module file |
| .ONTX |
theWord encrypted module file |
| .ONW |
Omron HMI NTST |
| .ONX |
OnyxGrass Image |
| .OO3 |
Omni Group Outliner 3 file |
| .OOA |
OOA Interchange Format Data |
| .OOC |
CHARTrunner definition data |
| .OODAGTDAT |
O&O Defrag binary report |
| .OODAGTID |
O&O Defrag binary report |
| .OODAGTRPD |
O&O Defrag binary report |
| .OODBRI |
O&O Defrag binary report |
| .OODBRP |
O&O Defrag GUI settings |
| .OODGUISETTINGS |
O&O Defrag GUI settings |
| .OOG |
PyGraph Python Graphics Interface Object Oriented Graphics |
| .OOGL |
Geomview Object Oriented Graphics Library |
| .OOK |
Arachne batch script file |
| .OOL |
Orbit object list |
| .OOPS |
Oops file |
| .OOS |
OpenOffice.org Spreadsheet |
| .OOT |
OpenOffice.org Text |
| .OP |
ESignal OptionsPlus |
| .OP_ |
GKSetup Support |
| .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 |
| .OPCSES |
Opticodec-PC data |
| .OPD |
Durango Interferometry Software Document |
| .OPDOWNLOAD |
Opera Partial Download File |
| .OPEF |
OmniPass Encrypted Folder |
| .OPENBSD |
OpenBSD readme file |
| .OPF |
Open Packaging Format (EPUB package document) |
| .OPG |
Offline Plan Generation Package |
| .OPI |
Adlib OCR Processing Information |
| .OPJ |
Origin Project |
| .OPK |
Sinking Island/LIle Noyée Game |
| .OPLC |
Nokia logo file |
| .OPLM |
Outline Processor Markup Language |
| .OPLX |
Omniplan project document |
| .OPML |
Outline Processor Markup Language |
| .OPN |
Court Opinion |
| .OPP |
IPhotoDVD |
| .OPPC |
Space Marine Game Resource Package |
| .OPPO |
oppo core data |
| .OPQ |
Eschalon: Book I Game |
| .OPR |
OPRO X Browser |
| .OPRC |
Palm OS data |
| .OPS |
Office Profile Settings |
| .OPSX |
Open Pedigree Standard Exchange Document |
| .OPT |
MySQL Database Options File (db.opt) |
| .OPTIONS |
SE-SOFT configuration file |
| .OPTS |
Linux configuration options file |
| .OPUS |
Opus Audio File (Ogg Opus) |
| .OPUSCERT |
Directory Opus certificate |
| .OPW |
OrgPlus For Windows Organization Chart |
| .OPX |
Microsoft Office Organization chart file format |
| .OPXT |
OrpPlus Template |
| .OPY |
OptiY Model |
| .OQY |
Microsoft Excel OLAP query file |
| .OR2 |
Lotus Organizer 2 file |
| .OR3 |
IBM Lotus Organizer 97 file |
| .OR4 |
Lotus Organizer data file |
| .OR5 |
IBM Lotus Organizer file |
| .OR6 |
Lotus Organizer data file |
| .OR8 |
Rational Rose Oracle8 Database Model Report |
| .ORA |
OpenRaster Image File |
| .ORB |
Original EBook Reader Ebook |
| .ORC |
CSound orchestra midi file |
| .ORD |
OMAX routed data |
| .ORDEREDTEST |
Microsoft Visual Studio ordered test file |
| .ORE |
Narbacular Drop game content file |
| .ORF |
Olympus Raw Format (Olympus/OM System camera raw image) |
| .ORG |
Lotus Organizer Data File |
| .ORG2+ |
Lotus Organizer |
| .ORI |
Need for Speed - Hot Pursuit file |
| .ORIG |
Original File (Backup of an Unmodified File) |
| .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 |
| .ORP |
WinSLAM data |
| .ORS |
DSP Group TrueSpeech Audio Format |
| .ORT |
COREX orthographic transcriptions file |
| .ORV |
Oracom video file |
| .ORX |
RadiantOne Virtual Directory Server database schema |
| .ORY |
Sage ACT! data |
| .ORZ |
Holic Game |
| .OS |
ObjectScript Source File |
| .OS2 |
Os2 System |
| .OS3 |
OS/2 Warp 3 |
| .OSA |
W32/Sober-AD |
| .OSAS |
Apple Script Library Tani Script |
| .OSAX |
FindFile OSAX mac file type |
| .OSB |
Sega Dreamcast Sounds file |
| .OSBX |
OneSafe Exported Backup |
| .OSC |
Remote Installation Services client installation wizard file |
| .OSCD |
TouchOSC Interface Editor Template |
| .OSD |
Open Software Description |
| .OSDX |
Microsoft Windows search connector file |
| .OSF |
Descent 3 Sound |
| .OSG |
OSGJS JSON Input |
| .OSGB |
OpenSceneGraph binary scene data |
| .OSGT |
OpenSceneGraph ASCII scene data |
| .OSH |
IBM InfoSphere schema |
| .OSINSTALLMESSAGES |
macOS system data |
| .OSK |
osu! Skin Package |
| .OSL |
OckamSoft Log |
| .OSM |
OpenStreetMap data file |
| .OSN |
Open Symbolic Notation data |
| .OSP |
OpenShot Video Project |
| .OSPX |
Dell KACE patch definition |
| .OSR |
osu! game replay file |
| .OSS |
Microsoft Office saved search file |
| .OST |
Outlook Offline Storage Table |
| .OSU |
osu! dialog file |
| .OSW |
ONESWING Contents |
| .OSX |
Apple Mac OS PowerPC executable file |
| .OSZ |
osu! Beatmap Package |
| .OT |
Atari Jaguar (TOM) object code file |
| .OTA |
OTA Bitmap file |
| .OTB |
Nokia OTA bitmap file |
| .OTC |
OpenDocument chart template file |
| .OTD |
OpenIV Texture Data |
| .OTF |
OpenType Font |
| .OTG |
OpenOffice.org graphics document template |
| .OTH |
Microsoft PowerToys Explorer tool |
| .OTI |
OpenDocument image template file |
