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Open Member Quote   Back a couple of years ago when I first found this forum I read and read other's problems and learned a bit. Then suddenly one day I had problems and turned to Cyber Tech Help for assistance and my problems were solved. Since then I have kept a number of programs on my them frequently and keep them updated. During this time its nearly as if spyware, virus and other nasties were never developed. My point is simply this follow the advise you get deligent in using what is suggested and the internet will be a much nicer place. Its only when I see a friend's computer who doesn't use any "protection" that I remember there were such things as pop ups. Thank you Cyber Tech Help - Webster  Close Member Quote
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File Extension Database

Find what program a filetype belongs to in our searchable File Extension Database.
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File Extension Database - O

File Extension Database 

The Cyber Tech Help File Extension Database is a searchable A-Z of file extensions.

To use the File Extension Database simply click on the first letter of the extension you are looking for.


Your Results are as follows :

  • .O - Object file (unix - Atari - GCC)
  • .O$$ - Outfile (Sprint)
  • .OAZ - Fax (NetFax Manager)
  • .OB - Object cut/paste file (IBM LinkWay)
  • .OBD - MS Office Binder
  • .OBJ - Object code (Intel Recolatable Object Module)
  • .OBR - Object browser data file (Borland C++)
  • .OBS - Script (ObjectScript)
  • .OBV - Visual interface (ObjectScript)
  • .OCA - Control Typelib Cache
  • .OCF - Object Craft File (Object Craft)
  • .OCM - AOL Advertising Control filesInternet Odyssey 2 Update
  • .OCP - Advanced Art StudioOffline Commander Project file
  • .OCR - Incoming fax transcribed to text (FAXGrapper)
  • .OCT - Radiance Octree Format
  • .OCX - OLE custom control
  • .ODF - Open Document InterchangeBattleZone Cartographers Guild fileStar Trek Armada Ship/Structure Infomation
  • .ODL - Type library source (Visual C++)
  • .OEB - Outlook Express Backup Wizard
  • .OFC - Open Financial Connectivity file
  • .OFD - Form definition (ObjectView)
  • .OFF - Object File Format vector graphics
  • .OFM - Adobe font
  • .OFT - MS Outlook Item Template
  • .OFX - Olicom Fax Open Financial Exchange file
  • .OGG - Ogg Vorbis Codec Compressed WAV file
  • .OGM - Ogg Vorbis Compressed Video file
  • .OKT - Music (Oktalizer)
  • .OLB - Object library (VAX)
  • .OLD - Backup file
  • .OLE - Object Linking and Embedding Object
  • .OLI - Text file (Olivetti)
  • .OMG - OpenMG Jukebox
  • .OMS - Briggs Softworks Order MavenMacintosh MP3 Music FormatOmega Downloader Configuration file
  • .OND - Lotus Notes-related file
  • .OOM - Swap file (Shroom)
  • .OPD - Omnipage file
  • .OPF - Flip Album file
  • .OPL - Psion Organiser Programming Language Source file
  • .OPN - Active options (Exact)
  • .OPT - Optimize support file (QEMM)
  • .OPW - Organization chart (Org Plus for Windows)
  • .OPX - Inactive options (Exact)
  • .OR2 - Lotus Organizer 2 file
  • .OR3 - Lotus Organizer 97 file
  • .OR4 - Lotus Organizer file
  • .OR5 - Lotus Organizer file
  • .ORA - Parameter file (Oracle)
  • .ORG - Calendar file (Lotus Organizer)
  • .OSD - Open Software Description file
  • .OSS - MS Office Saved Search
  • .OST - Microsoft Outlook Offline file
  • .OTF - Open Type Format
  • .OTL - Outline font description (Z-Soft Type Foundry)
  • .OTX - Text file (Olivetti Olitext Plus)
  • .OUT - Output file
  • .OV1 - Overlay file (part of program to be loaded when needed)
  • .OV2 - Overlay file (part of program to be loaded when needed)
  • .OVD - Datafile (ObjectVision)
  • .OVL - Overlay file (part of program to be loaded when needed)
  • .OVR - Overlay file (part of program to be loaded when needed)
  • .OVW - Cool Edit Pro OverviewfileCubase .WAV File ImageDIANA Overview file
  • .OWS - Web Studio 2 Project file

You searched for the letter O.