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