| .O |
Compiled Object File |
Free O Apps |
| .OA2 |
Fujitsu Oasys |
Free OA2 Apps |
| .OA3 |
Fujitsu Oasys |
Free OA3 Apps |
| .OAB |
Offline Address Book |
Free OAB Apps |
| .OAM |
Adobe Edge Animate Widget File |
Free OAM Apps |
| .OAP |
OutSystems Application Package |
Free OAP Apps |
| .OAR |
OpenSimulator Archive |
Free OAR Apps |
| .OAS |
Fujitsu Oasys |
Free OAS Apps |
| .OAT |
Android Optimized Application File |
Free OAT Apps |
| .OB! |
Orbit Downloader Incomplete Download |
Free OB! Apps |
| .OB2 |
Oberon-2 Source Code File |
Free OB2 Apps |
| .OBB |
Android Opaque Binary Blob File |
Free OBB Apps |
| .OBD |
Office Binder Document |
Free OBD Apps |
| .OBF |
OsmAnd Offline Map File |
Free OBF Apps |
| .OBI |
Outlook RSS Subscription File |
Free OBI Apps |
| .OBJ |
Relocatable Object Code |
Free OBJ Apps |
| .OBJ |
Wavefront 3D Object File |
Free OBJ Apps |
| .OBK |
Backup File |
Free OBK Apps |
| .OBML |
Opera Mini Saved Web Page |
Free OBML Apps |
| .OBML15 |
Opera Mini Saved Web Page |
Free OBML15 Apps |
| .OBML16 |
Opera Mini Saved Web Page |
Free OBML16 Apps |
| .OBP |
Bryce Object File |
Free OBP Apps |
| .OBT |
Openbox Theme File |
Free OBT Apps |
| .OBW |
Superior Drummer Sounds File |
Free OBW Apps |
| .OBZ |
Compressed 3D Object File |
Free OBZ Apps |
| .OC3 |
openCanvas 3 Event File |
Free OC3 Apps |
| .OC4 |
openCanvas 4 Event File |
Free OC4 Apps |
| .OC5 |
openCanvas 5 Event File |
Free OC5 Apps |
| .OCA |
Custom Control Library Type File |
Free OCA Apps |
| .OCC |
Oceanic DataPool File |
Free OCC Apps |
| .OCD |
OCAD Map File |
Free OCD Apps |
| .OCE |
Open Catalog Extension Connection File |
Free OCE Apps |
| .OCI |
openCanvas Image |
Free OCI Apps |
| .OCIMF |
OCIMF HVPQ File |
Free OCIMF Apps |
| .OCR |
FAXGrapper Fax Text File |
Free OCR Apps |
| .OCR |
Subtitle Workshop OCR Script |
Free OCR Apps |
| .OCT |
Radiance Octree File |
Free OCT Apps |
| .OCTEST |
Xcode Objective-C Unit Test Bundle |
Free OCTEST Apps |
| .OCX |
ActiveX Control |
Free OCX Apps |
| .OD |
Mascopt Graph Request File |
Free OD Apps |
| .ODA |
Office Document Architecture |
Free ODA Apps |
| .ODB |
OpenDocument Database |
Free ODB Apps |
| .ODB |
ABAQUS Database |
Free ODB Apps |
| .ODC |
OpenDocument Chart File |
Free ODC Apps |
| .ODC |
Office Data Connection File |
Free ODC Apps |
| .ODEX |
Optimized Dalvik Executable |
Free ODEX Apps |
| .ODF |
OpenDocument Formula |
Free ODF Apps |
| .ODF |
Battlezone Object Definition File |
Free ODF Apps |
| .ODF |
Open Document File |
Free ODF Apps |
| .ODFT |
OpenDocument Formula Template |
Free ODFT Apps |
| .ODG |
OpenDocument Graphic File |
Free ODG Apps |
| .ODI |
OpenDocument Image |
Free ODI Apps |
| .ODIF |
Open Document Interchange Format |
Free ODIF Apps |
| .ODIN |
Locky Ransomware Encrypted File |
Free ODIN Apps |
| .ODL |
Object Description Language File |
Free ODL Apps |
| .ODM |
OpenDocument Master Document |
Free ODM Apps |
| .ODM |
OverDrive Media File |
Free ODM Apps |
| .ODO |
Online Operating System Write Document |
Free ODO Apps |
| .ODP |
OpenDocument Presentation |
Free ODP Apps |
| .ODS |
Outlook Express 5 Mailbox |
Free ODS Apps |
| .ODS |
OpenDocument Spreadsheet |
Free ODS Apps |
| .ODT |
Origin Dialog Theme File |
Free ODT Apps |
| .ODT |
OpenDocument Text Document |
Free ODT Apps |
| .ODT |
OOMMF Data Table File |
Free ODT Apps |
| .ODTTF |
Obfuscated OpenType Font |
Free ODTTF Apps |
| .ODX |
BizTalk Server Orchestration File |
Free ODX Apps |
| .OEACCOUNT |
Windows Mail Account File |
Free OEACCOUNT Apps |
| .OEB |
Open eBook File |
Free OEB Apps |
| .OEB |
Outlook Express Backup Wizard File |
Free OEB Apps |
| .OEBZIP |
Zipped Open eBook File |
Free OEBZIP Apps |
| .OEM |
OEMEdit Save File |
Free OEM Apps |
| .OEM |
OEM Setup File |
Free OEM Apps |
| .OEX |
Opera Extension |
Free OEX Apps |
| .OFC |
Open Financial Connectivity File |
Free OFC Apps |
| .OFD |
OfficeForms Document |
Free OFD Apps |
| .OFF |
Object File Format |
Free OFF Apps |
| .OFFICEUI |
Microsoft Office UI Customization File |
Free OFFICEUI Apps |
| .OFL |
Ots File List |
Free OFL Apps |
| .OFM |
Melco Embroidery File |
Free OFM Apps |
| .OFM |
OmniForm Form |
Free OFM Apps |
| .OFP |
Origin Function Plot Theme File |
Free OFP Apps |
| .OFR |
SMS Offer Manager File |
Free OFR Apps |
| .OFR |
OptimFROG Audio File |
Free OFR Apps |
| .OFT |
Outlook File Template |
Free OFT Apps |
| .OFX |
Open Financial Exchange File |
Free OFX Apps |
| .OGA |
Ogg Vorbis Audio File |
Free OGA Apps |
| .OGF |
S.T.A.L.K.E.R. Model File |
Free OGF Apps |
| .OGG |
Ogg Vorbis Audio File |
Free OGG Apps |
| .OGG |
Origin Graph File |
Free OGG Apps |
| .OGGSTR |
Godot Engine Ogg Audio File |
Free OGGSTR Apps |
| .OGGU |
Origin Unicode Graph File |
Free OGGU Apps |
| .OGM |
Origin Matrix File |
Free OGM Apps |
| .OGM |
Ogg Media File |
Free OGM Apps |
| .OGMU |
Origin Unicode Matrix File |
Free OGMU Apps |
| .OGNC |
Dynamic Web Page |
Free OGNC Apps |
| .OGS |
Origons Movie Data File |
Free OGS Apps |
| .OGS |
Origin LabTalk Script File |
Free OGS Apps |
| .OGV |
Ogg Video File |
Free OGV Apps |
| .OGW |
Origin Workbook File |
Free OGW Apps |
| .OGWU |
Origin Unicode Workbook File |
Free OGWU Apps |
| .OGX |
Ogg Vorbis Multiplexed Media File |
Free OGX Apps |
| .OGZ |
Cube 2 Map File |
Free OGZ Apps |
| .OIF |
Origin Import Filter File |
Free OIF Apps |
| .OIS |
Origin Analyses Theme File |
Free OIS Apps |
| .OIV |
OpenIV Mod Package File |
Free OIV Apps |
| .OKT |
Oktalyzer Module |
Free OKT Apps |
| .OL |
Valve Hammer Object Layout File |
Free OL Apps |
| .OLA |
Online Access File |
Free OLA Apps |
| .OLB |
OLE Object Library |
Free OLB Apps |
| .OLB |
OrCAD Symbol Library File |
Free OLB Apps |
| .OLD |
Backup File |
Free OLD Apps |
| .OLK |
Outlook Address Book File |
Free OLK Apps |
| .OLK14CATEGORY |
Outlook Category File |
Free OLK14CATEGORY Apps |
| .OLK14CONTACT |
Outlook Contact File |
Free OLK14CONTACT Apps |
| .OLK14EVENT |
Outlook Calendar Event File |
Free OLK14EVENT Apps |
| .OLK14GROUP |
Outlook Group File |
Free OLK14GROUP Apps |
| .OLK14MAILACCOUNT |
Outlook Mail Account File |
Free OLK14MAILACCOUNT Apps |
| .OLK14MESSAGE |
Outlook Message File |
Free OLK14MESSAGE Apps |
| .OLK14MSGATTACH |
Outlook 2011 Email Message Attachment File |
Free OLK14MSGATTACH Apps |
| .OLK14MSGSOURCE |
Outlook Email Message Data File |
Free OLK14MSGSOURCE Apps |
| .OLK14NOTE |
Outlook Note File |
Free OLK14NOTE Apps |
| .OLK14PREF |
Outlook Preferences File |
Free OLK14PREF Apps |
| .OLK14SIGNATURE |
Outlook Signature File |
Free OLK14SIGNATURE Apps |
| .OLK14TASK |
Outlook Task File |
Free OLK14TASK Apps |
| .OLK15MSGATTACH |
Outlook 2016 Email Message Attachment File |
Free OLK15MSGATTACH Apps |
| .OLL |
TrialDirector Object Load List |
Free OLL Apps |
| .OLM |
Mac Outlook Database File |
Free OLM Apps |
| .OLP |
Office Live Package |
Free OLP Apps |
| .OLT |
Orbit Downloads List |
Free OLT Apps |
| .OMA |
Sony OpenMG Music File |
Free OMA Apps |
| .OMCS |
Office Manager Access File |
Free OMCS Apps |
| .OMF |
Open Media Framework File |
Free OMF Apps |
| .OMF |
OMF Interchange Image File |
Free OMF Apps |
| .OMG |
Image File |
Free OMG Apps |
| .OMG |
OpenMG Audio File |
Free OMG Apps |
| .OML |
OutSystems Modeling Language File |
Free OML Apps |
| .OMO |
OMake Object File |
Free OMO Apps |
| .OMOD |
Oblivion Mod Archive |
Free OMOD Apps |
| .OMP |
Office Manager Document Archive |
Free OMP Apps |
| .OMP |
OpenMind Windows Document |
Free OMP Apps |
| .OMS |
HP Printer Substrate Presets Package File |
Free OMS Apps |
| .OMX |
OtsAV Media Library Information File |
Free OMX Apps |
| .OND |
Lotus Notes Encapsulated Memo File |
Free OND Apps |
| .ONE |
OneNote Document |
Free ONE Apps |
| .ONEPKG |
Microsoft OneNote Package File |
Free ONEPKG Apps |
| .ONETOC |
Microsoft OneNote Table of Contents File |
Free ONETOC Apps |
| .ONETOC2 |
Microsoft OneNote Table of Contents File |
Free ONETOC2 Apps |
| .ONT |
theWord Bible Text Module |
Free ONT Apps |
| .ONTX |
theWord Encrypted Bible Text Module |
Free ONTX Apps |
| .OO3 |
OmniOutliner 3 File |
Free OO3 Apps |
| .OO3TEMPLATE |
OmniOutliner Template |
Free OO3TEMPLATE Apps |
| .OOK |
Arachne Batch Script |
Free OOK Apps |
| .OP |
OpenPAT Report |
Free OP Apps |
| .OP2 |
Nastran Output File |
Free OP2 Apps |
| .OP4 |
Nastran Output File |
Free OP4 Apps |
| .OPAL |
Microsoft Office User Settings File |
Free OPAL Apps |
| .OPAX |
Microsoft Office User Settings File |
Free OPAX Apps |
| .OPD |
Durango Document |
Free OPD Apps |
| .OPD |
OmniPage Document |
Free OPD Apps |
| .OPDOWNLOAD |
Opera Partially Downloaded File |
Free OPDOWNLOAD Apps |
| .OPEICO |
Opeico Text File |
Free OPEICO Apps |
| .OPENBSD |
OpenBSD Readme File |
Free OPENBSD Apps |
| .OPF |
FlipAlbum File |
Free OPF Apps |
| .OPF |
FlipViewer FlipBook File |
Free OPF Apps |
| .OPF |
Open Packaging Format File |
Free OPF Apps |
| .OPJ |
OrCAD Project File |
Free OPJ Apps |
| .OPJ |
Origin Project |
Free OPJ Apps |
| .OPJU |
Origin Unicode Project |
Free OPJU Apps |
| .OPK |
GCW Zero Open Package |
Free OPK Apps |
| .OPLC |
Nokia Operator Logo File |
Free OPLC Apps |
| .OPML |
Outline Processor Markup Language File |
Free OPML Apps |
| .OPS |
Office Profile Settings File |
Free OPS Apps |
| .OPT |
Options File |
Free OPT Apps |
| .OPT |
AGT Game Data File |
Free OPT Apps |
| .OPT |
Opterecenja File |
Free OPT Apps |
| .OPTIONS |
SE-SOFT Configuration File |
Free OPTIONS Apps |
| .OPTS |
Linux Configuration Options File |
Free OPTS Apps |
| .OPUS |
Opus Audio File |
Free OPUS Apps |
| .OPX |
FlipAlbum Photo Album File |
Free OPX Apps |
| .OPX |
OrgPlus Org Chart |
Free OPX Apps |
| .OQY |
Excel OLAP Query File |
Free OQY Apps |
| .OR2 |
Lotus Organizer 2 File |
Free OR2 Apps |
| .OR3 |
IBM Lotus Organizer 97 File |
Free OR3 Apps |
| .OR4 |
IBM Lotus Organizer 97 GS File |
Free OR4 Apps |
| .OR5 |
Lotus Organizer 5 File |
Free OR5 Apps |
| .OR6 |
Lotus Organizer 6 File |
Free OR6 Apps |
| .ORA |
OpenRaster Image File |
Free ORA Apps |
| .ORA |
Oracle Database Configuration File |
Free ORA Apps |
| .ORB |
Original eBook Reader File |
Free ORB Apps |
| .ORC |
Voyetra Digital Orchestrator File |
Free ORC Apps |
| .ORDEREDTEST |
Visual Studio Ordered Test File |
Free ORDEREDTEST Apps |
| .ORE |
Ore Executable File |
Free ORE Apps |
| .ORF |
Olympus RAW File |
Free ORF Apps |
| .ORG |
Lotus Organizer File |
Free ORG Apps |
| .ORI |
Original File |
Free ORI Apps |
| .ORIG |
Original File |
Free ORIG Apps |
| .ORT |
Rich Text Editor Document |
Free ORT Apps |
| .ORV |
Oracom Video File |
Free ORV Apps |
| .ORX |
RadiantOne VDS Database Schema |
Free ORX Apps |
| .OS |
ObjectScript Source File |
Free OS Apps |
| .OSAX |
AppleScript Scripting Addition |
Free OSAX Apps |
| .OSB |
Osu! Storyboard File |
Free OSB Apps |
| .OSB |
OpenStreetMap Binary Map File |
Free OSB Apps |
| .OSC |
OpenStreetMap Change File |
Free OSC Apps |
| .OSC |
Obix Source Code File |
Free OSC Apps |
| .OSDX |
Search Connector Description File |
Free OSDX Apps |
| .OSF |
Open Score |
Free OSF Apps |
| .OSFPVG |
OSFPVG |
Free OSFPVG Apps |
| .OSK |
osu! Skin File |
Free OSK Apps |
| .OSM |
OpenStreetMap Map File |
Free OSM Apps |
| .OSP |
OpenShot Project File |
Free OSP Apps |
| .OSR |
osu! Replay File |
Free OSR Apps |
| .OSS |
Microsoft Outlook Saved Search File |
Free OSS Apps |
| .OST |
Outlook Offline Data File |
Free OST Apps |
| .OSU |
Osu! Script |
Free OSU Apps |
| .OSX |
PowerPC Executable File |
Free OSX Apps |
| .OSZ |
osu! Beatmap File |
Free OSZ Apps |
| .OSZ |
OpenLP Service File |
Free OSZ Apps |
| .OT |
theWord Old Testament Text Module |
Free OT Apps |
| .OTA |
OTA Ringtone File |
Free OTA Apps |
| .OTA |
OTA Bitmap Image |
Free OTA Apps |
| .OTB |
Nokia Over The Air Bitmap Image |
Free OTB Apps |
| .OTC |
OpenDocument Chart Template |
Free OTC Apps |
| .OTF |
OpenTuft Tufting Design File |
Free OTF Apps |
| .OTF |
OpenDocument Formula Template |
Free OTF Apps |
| .OTF |
OpenType Font |
Free OTF Apps |
| .OTG |
OpenDocument Graphic Template |
Free OTG Apps |
| .OTH |
Origin Graph Theme File |
Free OTH Apps |
| .OTH |
OpenDocument HTML Template |
Free OTH Apps |
| .OTI |
OpenDocument Image Template |
Free OTI Apps |
| .OTL |
NoteTab Outline File |
Free OTL Apps |
| .OTLN |
Opal Outline File |
Free OTLN Apps |
| .OTM |
Origin Matrix Template |
Free OTM Apps |
| .OTM |
Outlook Macro File |
Free OTM Apps |
| .OTMU |
Origin Unicode Matrix Template |
Free OTMU Apps |
| .OTP |
OpenDocument Presentation Template |
Free OTP Apps |
| .OTP |
Origin Graph Template |
Free OTP Apps |
| .OTPU |
Origin Unicode Graph Template |
Free OTPU Apps |
| .OTRKEY |
OnlineTvRecorder Encoded Video File |
Free OTRKEY Apps |
| .OTS |
OtsAV Album File |
Free OTS Apps |
| .OTS |
OpenDocument Spreadsheet Template |
Free OTS Apps |
| .OTT |
OpenDocument Document Template |
Free OTT Apps |
| .OTW |
Origin Workbook Template |
Free OTW Apps |
| .OTWU |
Origin Unicode Workbook Template |
Free OTWU Apps |
| .OTX |
theWord Encrypted Old Testament Text Module |
Free OTX Apps |
| .OTZ |
OpenLP Theme File |
Free OTZ Apps |
| .OUT |
Output File |
Free OUT Apps |
| .OUT |
Compiled Executable File |
Free OUT Apps |
| .OV2 |
TomTom Points of Interest Database |
Free OV2 Apps |
| .OVA |
Octava Musical Score |
Free OVA Apps |
| .OVA |
Open Virtual Appliance |
Free OVA Apps |
| .OVE |
Overture Musical Score |
Free OVE Apps |
| .OVF |
Open Virtualization File |
Free OVF Apps |
| .OVH |
OMSI Vehicle Configuration File |
Free OVH Apps |
| .OVL |
Rollercoaster Tycoon 3 Data File |
Free OVL Apps |
| .OVOLOG |
ooVoo Log File |
Free OVOLOG Apps |
| .OVP |
The Overlay Maker Package File |
Free OVP Apps |
| .OVPN |
OpenVPN Configuration File |
Free OVPN Apps |
| .OVR |
The Overlay Maker Overlay File |
Free OVR Apps |
| .OVW |
Cubase WAVE Overview File |
Free OVW Apps |
| .OVW |
Logic Pro Overview File |
Free OVW Apps |
| .OVX |
Object-based Visual Application Language File |
Free OVX Apps |
| .OW |
Free Pascal 1.0.x Object File |
Free OW Apps |
| .OWC |
OutWit Catch Database |
Free OWC Apps |
| .OWG |
OutWit Gear Database |
Free OWG Apps |
| .OWL |
OWL Source Code File |
Free OWL Apps |
| .OWM |
OutWit XML Mashup File |
Free OWM Apps |
| .OWX |
OutWit Hub Automator File |
Free OWX Apps |
| .OXPS |
OpenXPS File |
Free OXPS Apps |
| .OXT |
Apache OpenOffice Extension |
Free OXT Apps |
| .OXYGENE |
Oxygene Project File |
Free OXYGENE Apps |
| .OYX |
Approach Alternate Database Index |
Free OYX Apps |
| .OZ |
Opera Job Management Compressed File |
Free OZ Apps |
| .OZB |
MU Online Image File |
Free OZB Apps |
| .OZJ |
MU Online Image File |
Free OZJ Apps |
| .OZT |
MU Online Image File |
Free OZT Apps |