Browse file extensions
with the first letter of the file name suffix: o

Just click below the file extension you are looking for and you will find programs that can be used to open it.

List of file extension entries starting with the letter o

  • .o Various objects
  • .o00 Always Technology SCSI Controller Driver
  • .o01 Typhoon voice
  • .o2c Objects to See 3D file format
  • .o2s Oracle to MySQL Converter data
  • .o3d Google Open 3D web graphic format
  • .o8d OCTGN deck file
  • .o8g OCTGN game definition data
  • .o8s OCTGN settings
  • .oa OpenAccess database of OrCAD PCB Designer
  • .oa0 B.O.U.T. Evolution texture
  • .oa2 Fujitsu OASYS 2 document
  • .oa3 OASYS 3 document
  • .oab Microsoft Outlook offline address book
  • .oac Grand Theft Auto V audio data
  • .oad Suite Notaro document
  • .oaf ETH Oberon applet
  • .oam Adobe Edge overlay
  • .oap Samsung bada signed installation package
  • .oar HSQLDB database
  • .oas Microsoft Outlook Attachment Sniffer data
  • .oat Google Android RunTime optimized app
  • .oav Microsoft Flight Simulator texture
  • .oaw openArchitectureWare workflow data
  • .oaz NetFax Manager OAZ fax image
  • .ob IBM LinkWay object
  • .ob! Orbit Downloader incomplete download
  • .ob2 Oberon 2 source code
  • .ob3 ABF software Outlook Backup backup
  • .ob5 TopLang OE Backup file
  • .obak WinSQL offline backup file
  • .obb Opaque binary blob for Android
  • .obc AICON 3D Scanner photogrammetry data
  • .obd Microsoft Office Binder document
  • .obf OsmAnd offline GPS vector maps
  • .obg ZBrush mesh data
  • .obi RSS subscription file from Microsoft Outlook 2007 and above versions
  • .obj Wavefront 3D object
  • .objectcache Cache
  • .objx Metatools object bryce support
  • .obk OrCAD capture design or library
  • .obl trueSpace data
  • .obm EIAS camera motion export
  • .obml Opera Mini saved web page
  • .obml15 Opera Mini 5.1 saved web page
  • .obml16 Opera Mini saved web page file
  • .obp Bryce 3D object
  • .obpack ObjectBar theme pack
  • .obr OSGi Bundle Repository data
  • .obs WAsP obstacle list data
  • .obs-service Open Broadcaster Software data
  • .obskin ObjectBar skin
  • .obt Microsoft Office Binder template
  • .obv 3D Photo Browser thumbnail cache
  • .obw Toontrack Superior Drummer audio
  • .obx IBM Rational XDE data
  • .oby EPOC ROM image
  • .obz Microsoft Office Binder wizard data
  • .oc_ Compressed ActiveX control data
  • .oc4 openCanvas event data
  • .oc5 openCanvas event data
  • .oc9 OrgCon organization data
  • .oca Visual Basic Control Typelib Cache file
  • .ocamlmakefile Caml programming language makefile
  • .ocb Origin precompiled Origin C source code
  • .occ DB/TextWorks Terms and Words database
  • .ocd OCAD digitized map
  • .ocdc Mathematica document file
  • .ocdf OneClickDigital mp3 audiobook
  • .oce Open Catalog extension connection data
  • .ocf OM2 Cipher data
  • .ocg Osprey custom graph
  • .och Satellite and Channel settings backup
  • .oci openCanvas picture image
  • .ocl Object Constraint Language data
  • .ocm Netscape Communicator aim data
  • .oco Open Color Format palette
  • .ocp Advanced Art Studio picture
  • .ocr FaxGrapper FAX transcribed text
  • .ocrec Microsoft Lync data
  • .ocs eDoc DigiSign digitally signed document
  • .ocsmeet Microsoft Lync data
  • .ocsp HAProxy OCSP data
  • .oct RADIANCE Octree Format
  • .ocv OCV training data
  • .ocw Oracle Configuration Watch template
  • .ocx ActiveX control item
  • .od Mascotte Mascopt request
  • .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 ArcView object database ASCII data
  • .odc OpenDocument chart
  • .odccubefile OpenDocument 1 chart
  • .odcdatabasefile Microsoft Office data
  • .odcnewfile Microsoft Office data connection

What is the meaning of a file extension?

File extensions are characters that appear after the dot in a computer file's name. For example, the file "unknown-file.pdf" has the file extension "pdf". This is used to identify which program should open the file or what file type it is.
File extensions help you organize and manage files. They provide a quick and easy way to identify and associate the file type with the appropriate software.

We can help you open your file

In our database, we have collected a huge number of different file extensions, detailed descriptions, and programs that can be used to open or otherwise work with the file extensions listed in our database.
This database is an invaluable resource for users who want to understand better file extensions and what they can do with them. It also allows users to know different file types with the same purpose.

Only verified software links are provided

We have verified every software listed in our database. The software listed in our database includes links to the developer's or software's website. These links should allow you to download the right program for each file type. Using verified software from reputable sources helps minimize the risk of malware and viruses infecting your computer.