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List in alphabetic order - O
O
Compiled Object Format
O01
Typhoon Voice
O2C
Objects To See 3D
O8D
OCTGN Deck
O8G
OCTGN Game Definition
O8O
Mediator 5 Repository Tabs Vorlagen.006
O8S
OCTGN Set
OAB
Offline Address Book
OAD
Suite Notaro Document
OAF
Microsoft Flight Simulator Texture
OAM
Adobe Edge Animate Widget Format
OAP
Samsung Bada Signed Installation Package
OAR
OpenSimulator Archive
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
OB3
ABF Software Outlook Backup Backup
OB5
TopLang OE Backup
OBAK
WinSQL Offline Backup
OBB
Android Opaque Binary Blob Format
OBD
Office Binder Document
OBF
OsmAnd Offline GPS Vector Maps
OBG
ZBrush Mesh
OBI
Outlook RSS Subscription Format
OBJ
Wavefront 3D Object Format
OBJX
Metatools Object Bryce Support
OBK
OrCAD Capture Design Or Library
OBL
TrueSpace
OBML
Opera Mini Saved Web Page
OBML15
Opera Mini 5.1 Saved Web Page
OBP
Bryce Object Format
OBPACK
ObjectBar Theme Pack
OBR
Borland C++ Object Browser Data
OBS
WAsP Obstacle List
OBT
Openbox Theme Format
OBV
3D Photo Browser Thumbnail Cache
OBW
Superior Drummer Sounds Format
OBX
Rational XDE
OBYX
Obyx Control
OBZ
Compressed 3D Object Format
OC3
OpenCanvas 3 Event Format
OC4
OpenCanvas 4 Event Format
OC5
OpenCanvas 5 Event Format
OC9
OrgCon Organization
OCA
Custom Control Library Type Format
OCAMLMAKEFILE
Caml Programming Language Makefile
OCB
Origin Precompiled Origin C
OCC
Oceanic DataPool Format
OCD
OCAD Map Format
OCDC
Mathematica Document
OCDF
OneClickDigital Mp3 Audio Book
OCE
Open Catalog Extension Connection Format
OCEN
EdGCM Data
OCF
OM2 Cipher
OCG
Osprey Custom Graph
OCI
OpenCanvas Image
OCM
Netscape Communicator Aim
OCP
Advanced Art Studio Image
OCR
FAXGrapper Fax Text Format
OCT
Radiance Octree Format
OCTEST
Xcode Objective-C Unit Test Bundle
OCV
OCV Training Data
OCX
ActiveX Control
OC_
Compressed ActiveX Control
OD
Mascopt Graph Request Format
OD1
Omnis 5 Database
OD2
Omnis 5 Database
OD3
Omnis Studio Database
OD4-9
Omnis5 Database
ODB
OpenDocument Database
ODC
Office Data Connection Format
ODCCUBEFILE
OpenDocument 1
ODCNEWFILE
Microsoft Office Data Connection
ODCTABLEFILE
Microsoft Office
ODE
Microsoft Office
ODEX
Google Android Optimized Executalbe
ODF
OpenDocument Formula
ODG
OpenDocument Graphic Format
ODH
Microsoft Visual Studio Interface Definition Language
ODI
OpenDocument Image
ODIF
Open Document Interchange Format
ODL
Object Description Language Format
ODM
OverDrive Media Format
ODO
Online Operating System Write Document
ODP
OpenDocument Presentation
ODS
OpenDocument Spreadsheet
ODT
OpenDocument Text Document
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
BizTalk Server Orchestration Format
OD_
Oracle Compressed Driver
OEACCAOUNT
Windows Mail
OEACCOUNT
Windows Mail Account Format
OEB
Outlook Express Backup Wizard Format
OECL
Open EDA Component Library
OEF
Optim Export
OEM
OEM Setup Format
OEMIGACCOUNT
Outlook Express Temporary
OET
ESignal Order Entry Ticket
OEX
Opera Extension
OFA
Kodak OfotoNow
OFB
Oxygen Forensic Suite Backup
OFC
Open Financial Connectivity Format
OFD
ObjectView Form Definition
OFF
Object Format
OFFICEUI
Microsoft Office UI Customization
OFFSETS
Offset
OFL
Ots Format List
OFM
Melco Embroidery Format
OFN
MS Office Format New (Other Office Documents)
OFP
Objecteering Project
OFR
OptimFROG Audio Format
OFS
OptimFROG Dualstream
OFT
Outlook Format Template
OFX
Open Financial Exchange Format
OGA
Ogg Vorbis Audio Format
OGD
Oracle Forms Graph
OGF
S.T.A.L.K.E.R. Model Format
OGG
Ogg Vorbis Audio Format
OGL
ATI Overlay Source Code
OGM
Ogg Media Format
OGNC
Dynamic Web Page
OGO
Origin Graphic Object
OGR
OGR C++ Open Source Library
OGS
Origons Movie Data Format
OGV
Ogg Video Format
OGW
OriginLab Worksheet
OGX
Ogg Vorbis Multiplexed Media Format
OGZ
Cube 2 Map Format
OH
DrillAssistant List
OH4
Overhoor List
OHP
MS-DOS 7
OHS
Bink Outbound History
OHW
Overhoor DrillAssistant List
OIF
QuickBase Web-sharable Database Interchange
OIL
Open Image Library Format Image Format
OJP
3WayPack
OK
Qedit
OKM
OkMap Map Defining
OKOZO
Okozo Desktop Animation
OKR
PowerRecover One Key Recovery
OKS
OKScript
OKT
Oktalyzer Module
OKX
OKScript
OL
Valve Hammer Object Layout
OLA
Online Access Format
OLB
OLE Object Library
OLB2
CanOpener Library
OLD
Backup Format
OLE
Microsoft Object Linking And Embedding
OLE2
Microsoft Office Binary Document Container Format
OLF
OyezForms Legal Documents
OLK
Outlook Address Book Format
OLK14CATEGORY
Outlook Category Format
OLK14CONTACT
Outlook Contact Format
OLK14DBHEADER
Microsoft Outlook 2011 For Mac Database
OLK14EVENT
Outlook Calendar Event Format
OLK14FOLDER
Microsoft Outlook 2011 For Mac Folder
OLK14GROUP
Outlook Group Format
OLK14MAILACCOUNT
Outlook Mail Account Format
OLK14MESSAGE
Outlook Message Format
OLK14MSGATTACH
Microsoft Outlook 2011 For Mac Message Attachment
OLK14MSGSOURCE
Outlook Email Message Data Format
OLK14NOTE
Outlook Note Format
OLK14PREF
Outlook Preferences Format
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
Outlook Signature Format
OLK14TASK
Outlook Task Format
OLK14UID
Microsoft Outlook 2011 For Mac UID
OLL
TrialDirector Load
OLM
Mac Outlook Database Format
OLN
Microsoft Visual C++ Outline Examples
OLPROJ
Adobe OnLocation
OLS
Microsoft Office List Shortcut
OLT
Orbit Downloads List
OLV
Roller Coaster Tycoon
OLY
AFP Advanced Function Presentation Overlay Resource
OMA
Sony OpenMG Music Format
OMC
Origin Customized Menu
OMCS
Office Manager Access Format
OMD
MapInfo Routing J Server Data
OMEG
Mathematica For Mac
OMF
Open Media Framework Format
OMFI
Open Media Framework
OMG
O&O DiskImage Backup Format
OML
TracePro Model
OMN
Omnipotent Collection
OMO
OMake Object Format
OMOD
Oblivion Mod Archive
OMP
Office Manager Document Archive
OMR
OMR Template
OMS
Order Maven
OMT
SITH HLA Object Model Template
OMX
OtsAV Media Library Information Format
ON2
On2 Encoded FLV
OND
Lotus Notes Encapsulated Memo Format
ONE
OneNote Document
ONECACHE
Microsoft OneNote Cache
ONEPKG
Microsoft OneNote Package Format
ONETMP
Microsoft OneNote Temporary
ONETOC
Microsoft OneNote Table Of Contents
ONETOC2
Microsoft OneNote Table Of Contents Format
ONM
Outdoor Navigator Map
ONT
TheWord Bible Text Module
ONTX
TheWord Encrypted Bible Text Module
ONW
Omron HMI NTST
ONX
OnyxGrass Image
OO3
OmniOutliner 3 Format
OOG
PyGraph Python Graphics Interface Object Oriented Graphics
OOGL
Geomview Object Oriented Graphics Library
OOK
Arachne Batch Script
OOS
OpenOffice.org Spreadsheet
OOT
OpenOffice.org Text
OP
ESignal OptionsPlus
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
OPD
Durango Interferometry Software Document Format
OPDOWNLOAD
Opera Partially Downloaded Format
OPEF
OmniPass Encrypted Folder
OPENBSD
OpenBSD Readme Format
OPF
Open Packaging Format
OPG
Offline Plan Generation Package
OPI
Adlib OCR Processing Information
OPJ
OrCAD Project Format
OPK
Sinking Island/LIle Noyée Game
OPLC
Nokia Operator Logo Format
OPLM
Outline Processor Markup Language
OPML
Outline Processor Markup Language Format
OPN
Court Opinion
OPP
IPhotoDVD
OPPC
Space Marine Game Resource Package
OPQ
Eschalon: Book I Game
OPR
OPRO X Browser
OPS
Office Profile Settings Format
OPT
MySQL Database Data Format
OPTIONS
SE-SOFT Configuration Format
OPTS
Linux Configuration Options Format
OPUS
Opus Audio Format
OPW
OrgPlus For Windows Organization Chart
OPX
OrgPlus Org Chart
OPXT
OrpPlus Template
OPY
OptiY Model
OP_
GKSetup Support
OQY
Excel OLAP Query Format
OR2
Lotus Organizer 2 Format
OR3
IBM Lotus Organizer 97 Format
OR4
IBM Lotus Organizer 97 GS Format
OR5
Lotus Organizer 5 Format
OR6
Lotus Organizer 6 Format
OR8
Rational Rose Oracle8 Database Model Report
ORA
Oracle Database Configuration Format
ORB
Original EBook Reader Ebook
ORC
CSound Orchestra Midi Format
ORDEREDTEST
Visual Studio Ordered Test Format
ORE
Ore Executable Format
ORF
Olympus RAW Format
ORG
Lotus Organizer Format
ORG2+
Lotus Organizer
ORI
Original Format
ORIG
Original Format
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
ORS
DSP Group TrueSpeech Audio Format
ORT
COREX Orthographic Transcriptions Format
ORV
Oracom Video Format
ORX
RadiantOne VDS Database Schema
ORZ
Holic Game
OS
ObjectScript Source Format
OS2
Os2 System
OS3
OS/2 Warp 3
OSA
W32/Sober-AD
OSAS
Apple Script Library Tani Script
OSAX
FindFile OSAX Mac Format Type
OSB
OpenStreetMap Binary Map Format
OSBX
OneSafe Exported Backup
OSC
Remote Installation Services Client Installation Wizard Format
OSCD
TouchOSC Interface Editor Template
OSD
Open Software Description
OSDX
Search Connector Description Format
OSF
Descent 3 Sound
OSG
OSGJS JSON Input
OSK
Osu! Skin Format
OSL
OckamSoft Log
OSM
OpenStreetMap Map Format
OSP
OpenShot Project Format
OSR
Osu! Replay Format
OSS
Microsoft Outlook Saved Search Format
OST
Outlook Offline Folder Format
OSU
Osu! Script
OSW
ONESWING Contents
OSX
PowerPC Executable Format
OSZ
Osu! Beatmap Format
OT
TheWord Old Testament Text Module
OTA
OTA Bitmap Image
OTB
Nokia Over The Air Bitmap Image
OTC
OpenDocument Chart Template
OTD
OpenIV Texture Data
OTF
OpenType Font
OTG
OpenDocument Graphic Template
OTH
OpenDocument HTML Template
OTI
OpenDocument Image Template
OTL
NoteTab Outline Format
OTLN
Opal Outline Format
OTM
Outlook Macro Format
OTP
OpenDocument Presentation Template
OTR
IRIX Complied FTR
OTRKEY
OnlineTvRecorder Encoded Video Format
OTS
OpenDocument Spreadsheet Template
OTT
OpenDocument Document Template
OTV
Rotor-Disc OTV Kit OTV Calibration
OTX
TheWord Encrypted Old Testament Text Module
OTZ
OpenLP Theme Format
OUT
Output Format
OUTLINE
FontTwister Letter Outline
OUTLOOK97
Microsoft Outlook Custom Mail
OUX
Bibexcel
OV
OpenInsight Database Overflow
OV1
Overlay
OV2
TomTom Points Of Interest Database
OV3
Overlay
OV4
Overlay
OV5
Overlay
OVA
Open Virtual Appliance
OVD
ObjectVision Data
OVE
Overture Musical Score
OVF
Open Virtualization Format
OVG
ObjectVision Converted Graphic
OVH
OMSI Bus Settings
OVL
Rollercoaster Tycoon 3 Data Format
OVOLOG
OoVoo Log
OVP
The Overlay Maker Package Format
OVPN
OpenVPN Configuration Format
OVR
The Overlay Maker Overlay Format
OVS
Ovation 1 Style Sheet
OVW
Logic Pro Overview Format
OW
Free Pascal 1.0.x Object Format
OWC
OutWit Catch Database
OWG
OutWit Gear Database
OWL
OWL Source Code Format
OWM
OutWit XML Mashup Format
OWR
PeopleSoft Results Archive
OWS
Web Studio Project
OWT
Ancestry.com OneWorldTree
OX
Ox Object-Oriented Matrix Programming Language
OXD
PS3 Proxy Server
OXF
IBM Rational Rhapsody
OXO
Ox Object-Oriented Matrix Programming Language
OXPS
OpenXPS Format
OXT
Apache OpenOffice Extension
OXYGENE
Oxygene Project Format
OYX
Approach Alternate Database Index
OYZ
Lotus Approach Alternate DBASE Index
OZ
Opera Job Management Compressed Format
OZF2
OziExplorer Map
OZFX3
OziExplorer Image
OZJ
Mu Online Graphic
OZP
Orgadata LogiKal
OZT
Mu Online Texture
Categories
3D Image Files
Audio Files
Backup Files
CAD Files
Compressed Files
Data Files
Database Files
Developer Files
Disk Image Files
Encoded Files
Executable Files
Font Files
Game Files
GIS Files
Layout Files
Misc Files
Plugin Files
Raster Image Files
Settings Files
Spreadsheet Files
System Files
Text Files
Vector Image Files
Video Files
Web Files