File Extension O - UNIX/GCC Object File , etc
File Extension O$$ - Output File , etc
File Extension O01 - Typhoon Voice File , etc
File Extension O1 - Free Pascal Object File for GO321v1 Platform (FPC Development Team), etc
File Extension O2C - Objects to See 3D File Format (mb Software AG), etc
File Extension O3 - Ozone Messenger Program Support Files (htmlland.net), etc
File Extension O8O - Mediator5 Repositorytabs Vorlagen.006 File , etc
File Extension OAB - Outlook Address Book (Microsoft Corporation), etc
File Extension OAF - ETH Oberon Applet File , etc
File Extension OAH2DS - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OARC - Optix Archive Manifest (mindwrap, inc.), etc
File Extension OAZ - NetFax Manager OAZ Fax File , etc
File Extension OB - ABF Outlook Backup Backup File (ABF software, Inc.), etc
File Extension OB! - Orbit Downloader Incomplete Download (OrbitDownloader.com), etc
File Extension OB$ - Compressed OBJ (Microsoft Corporation), etc
File Extension OB1 - OzWin CompuServe E-mail/Forum Access Saved Outbox File , etc
File Extension OBA - Timespace X100 Digital Video Recorder Video File (Timespace Technology Ltd.), etc
File Extension OBD - Office Binder Document (Microsoft Corporation), etc
File Extension OBE - System DLL Oobe File , etc
File Extension OBJ - Hyperion-CADRazor 3D Model (TITAN Algorithms), etc
File Extension OBJ0 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OBJ1 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OBJECT - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OBK - Ubi Soft Chessmaster Opening Book File , etc
File Extension OBML - Opera Mini Saved Web Page (Opera Software ASA), etc
File Extension OBN - Oberon-2 Module Source File , etc
File Extension OBP - Bryce 5 Object Preset (DAZ Productions), etc
File Extension OBPACK - ObjectBar Object Package (Stardock Corporation, Inc.), etc
File Extension OBR - Objective Reference Document Link (Objective Corporation Limited), etc
File Extension OBS - ObjectScript Script , etc
File Extension OBSKIN - ObjectBar Skin File (Stardock Corporation, Inc.), etc
File Extension OBT - Office Binder Template (Microsoft Corporation), etc
File Extension OBTHEM - ObjectBar Theme File (Stardock Corporation, Inc.), etc
File Extension OBV - ObjectScript Visual Interface , etc
File Extension OBX - Rational XDE (IBM), etc
File Extension OBZ - Office Binder Wizard (Microsoft Corporation), etc
File Extension OC8 - OrgCon 8 Organization (EcoMerc), etc
File Extension OC9 - OrgCon 9 Organization (EcoMerc), etc
File Extension OCA - Visual Basic Control Typelib Cache , etc
File Extension OCB - Origin Precompiled Origin C File (OriginLab Corporation), etc
File Extension OCC - DB/TextWorks Database Terms and Words (Inmagic, Inc.), etc
File Extension OCCSAN - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OCD - OrgCon 7 Organization (EcoMerc), etc
File Extension OCE - Brio Query (Hyperion Solutions Corporation), etc
File Extension OCEN - EdGCM Data File (The EdGCM Cooperative Project of Columbia University), etc
File Extension OCF - Object Craft File , etc
File Extension OCI - openCanvas Image (System Products Co., Ltd.), etc
File Extension OCM - Netscape Communicator Aim File , etc
File Extension OCN - OneCable.net - Explorer Measurement Data File (OnTimeLine), etc
File Extension OCP - Advanced Art Studio , etc
File Extension OCR - FAXGrapper FAX Text File , etc
File Extension OCS - eDoc DigiSign Digitally Signed Document (Fujitsu Denmark), etc
File Extension OCSP - Optix Scanner Plug-in (mindwrap, inc.), etc
File Extension OCT - Radiance Octree Format , etc
File Extension OCTOPU - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OCX - Object Linking and Embedding (OLE) Control Extension (Microsoft Corporation), etc
File Extension OC_ - Doko Compressed Install File , etc
File Extension OD1 - Omnis5 Database File , etc
File Extension OD2 - Omnis5 Database File , etc
File Extension OD3 - Omnis5 Database File , etc
File Extension OD4 - Omnis5 Database File , etc
File Extension OD5 - Omnis5 Database File , etc
File Extension OD6 - Omnis5 Database File , etc
File Extension OD7 - Omnis5 Database File , etc
File Extension OD8 - Omnis5 Database File , etc
File Extension OD9 - Omnis5 Database File , etc
File Extension ODA - ODA Document , etc
File Extension ODB - ArcView Object Database ASCII File (ESRI), etc
File Extension ODC - OpenOffice/StarOffice OpenDocument (Ver 2) Chart (Sun Microsystems, Inc.), etc
File Extension ODCCUB - Office Data Connection , etc
File Extension ODCDAT - Office Data Connection , etc
File Extension ODCNEW - Office Data Connection , etc
File Extension ODCTAB - Office Data Connection , etc
File Extension ODD - Coby Voice Recorder Format (Coby Electronics Corp.), etc
File Extension ODDS - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension ODE - Office Object Data Embedding File (Microsoft Corporation), etc
File Extension ODF - Star Trek Armada Ship/Structure Infomation , etc
File Extension ODG - OpenOffice/StarOffice OpenDocument (Ver 2) Graphics Document (Sun Microsystems, Inc.), etc
File Extension ODH - Odigo History File (Comverse, Inc. a part of Comverse Technology), etc
File Extension ODI - OpenOffice/StarOffice OpenDocument (Ver 2) Image (Sun Microsystems, Inc.), etc
File Extension ODIF - Open Document Interchange Format , etc
File Extension ODL - Visual C++ Type Library Source (Interface Definition Language File) (Microsoft Corporation), etc
File Extension ODM - Opendisc Software (Opendisc), etc
File Extension ODP - OpenOffice/StarOffice OpenDocument (Ver 2) Presentation (Sun Microsystems, Inc.), etc
File Extension ODS - NCompass Labs Internet Script , etc
File Extension ODS# - OpenOffice/StarOffice OpenDocument (Ver 2) Open Spreadsheet (Sun Microsystems, Inc.), etc
File Extension ODT - OpenOffice/StarOffice OpenDocument (Ver 2) Text Document (Sun Microsystems, Inc.), etc
File Extension ODU - Odigo User File (Comverse, Inc. a part of Comverse Technology), etc
File Extension ODZ - IBM OpenDoc Editor Package File , etc
File Extension OEB - Open eBook Document (International Digital Publishing Forum (IDPF)), etc
File Extension OEM - SB_AWE Keys SB_NT File , etc
File Extension OF - LessDATA Video System OneFile File , etc
File Extension OFASTE - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OFC - Open Financial Connectivity File , etc
File Extension OFD - OfficeForms Form Data File (Toplevel Computing), etc
File Extension OFF - 3D Mesh Object File Format , etc
File Extension OFFENS - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OFFICE - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension OFM - Font (Adobe Systems Incorporated), etc
File Extension OFN - Office FileNew File (Microsoft Corporation), etc