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Data Formats and File Extensions: O

Search for data file formats and extensions that begin with the letter O, or search more than 4,000 file extensions by the letter or number the file format starts with.

With literally thousands of data file formats employed by Windows and Window-based apps, keeping track of all the file extensions employed by your software applications and programs can be quite a challenge. Fortunately, Webopedia's Complete List of Data File Formats and File Extensions makes it quick and easy to sift through thousands of file extensions and data file formats to find exactly what you need. You can peruse the full list or search for data formats and file extensions based on the letter they start with from the table below.

Number  Symbol  A  B  C  D  E  F  G  H  I  J  K 
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  Data File Formats that Begin with the Letter 'O'

.oObject file (unix - Atari - GCC)
.o$$Outfile (Sprint)
.oazFax (NetFax Manager)
.obObject cut/paste file (IBM LinkWay)
.obdMS Office Binder
.objObject code (Intel Recolatable Object Module)
.obrObject browser data file (Borland C++)
.obsScript (ObjectScript)
.obvVisual interface (ObjectScript)
.ocaControl Typelib Cache
.ocfObject Craft File (Object Craft)
.ocmAOL Advertising Control files
Internet Odyssey 2 Update
.ocpAdvanced Art Studio
Offline Commander Project file
.ocrIncoming fax transcribed to text (FAXGrapper)
.octRadiance Octree Format
.ocxOLE ActiveX custom control
.odfOpen Document Interchange
BattleZone Cartographers Guild file
Star Trek Armada Ship/Structure Infomation
.odgOpenDocument Graphic file
.odlType library source (Visual C++)
.odpOpenOffice Presentation file
.odsOpenOffice Spreadsheet file
.odtOpenOffice OpenDocument text document
.oebOutlook Express Backup Wizard
.oemTextSetup OEM file
.ofcOpen Financial Connectivity file
.ofdForm definition (ObjectView)
.offObject File Format vector graphics
.ofmAdobe font
.oftMS Outlook Item Template
.ofxOlicom Fax
Open Financial Exchange file
.oggOgg Vorbis Codec Compressed WAV file
.ogmOgg Vorbis Compressed Video file
.ogvVideo Container file
.oktMusic (Oktalizer)
.olbObject library (VAX)
.oldBackup file
.oleObject Linking and Embedding Object
.oliText file (Olivetti)
.omaOpenMG Music file
.omfOpen Media file
.omgOpenMG Jukebox
.omsBriggs Softworks Order Maven
Macintosh MP3 Music Format
Omega Downloader Configuration file
.ondLotus Notes-related file
.oneOneNote Document File
.ontBible file
.oomSwap file (Shroom)
.opdOmnipage file
.opfFlip Album file
Open Packaging Format file
.oplPsion Organiser Programming Language Source file
.opnActive options (Exact)
.opsMicrosoft Office profile settings file
.optOptimize support file (QEMM)
.opwOrganization chart (Org Plus for Windows)
.opxInactive options (Exact)
.or2Lotus Organizer 2 file
.or3Lotus Organizer 97 file
.or4Lotus Organizer file
.or5Lotus Organizer file
.oraParameter file (Oracle)
.orgCalendar file (Lotus Organizer)
.osdOpen Software Description file
.ossMS Office Saved Search
.ostMicrosoft Outlook Offline file
.otfOpen Type Format
.otlOutline font description (Z-Soft Type Foundry)
.otxText file (Olivetti Olitext Plus)
.outOutput file
.ov1Overlay file (part of program to be loaded when needed)
.ov2Overlay file (part of program to be loaded when needed)
.ovdDatafile (ObjectVision)
.ovlOverlay file (part of program to be loaded when needed)
.ovrOverlay file (part of program to be loaded when needed)
.ovwCool Edit Pro Overviewfile
Cubase .WAV File Image
DIANA Overview file
.owsWeb Studio 2 Project file
.oxtOpen Office Extension file

Recommended Reading: An Introduction to Data File Formats and Their File Extensions

Number  Symbol  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  Full List


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