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Alphabetic File Extension List

This list will take for a moment to be fully loaded as the file extension lists are quite long. These lists contain information about the extension name, the name of the program, and the creator's company. Click on the extension to see the detail page. The total extensions in this list: 73.

Extension Information
OAB Outlook Address Book (Microsoft Corporation)
OBI
OBJ Blender 3D Object (The Blender Foundation)
OBJ UVMapper Object (Stephen L Cox)
OBJ Relocatable Object Code
OCA Control Typelib Cache (Microsoft Corporation)
OCX Object Linking and Embedding (OLE) Control Extension (Microsoft Corporation)
OD
ODB Psion Organiser Datafile and LZ Diary File (Psion PLC)
ODB OpenOffice/StarOffice OpenDocument (Ver 2) Database (Sun Microsystems, Inc.)
ODB Organizers Database (ODB) Database (Organizers' Collaborative)
ODBC
ODC OpenOffice/StarOffice OpenDocument (Ver 2) Chart (Sun Microsystems, Inc.)
ODF OpenOffice/StarOffice OpenDocument (Ver 2) Formula (Sun Microsystems, Inc.)
ODF OnkoS Data (OnkoS)
ODM Opendisc Software (Opendisc)
ODM OverDrive Media Console Media Control File (OverDrive Inc.)
ODM OpenOffice/StarOffice OpenDocument (Ver 2) Global Text Document (Sun Microsystems, Inc.)
ODS OpenOffice/StarOffice OpenDocument (Ver 2) Spreadsheet (Sun Microsystems, Inc.)
ODT OpenOffice/StarOffice OpenDocument (Ver 2) Text Document (Sun Microsystems, Inc.)
ODT MindRender Virtual Reality Explorer Kit (VREK) Object File Format (Themekit Systems Ltd.)
OEM OEM Data Used During Device Install
OEM Text Listing of Supported OEM Devices for WinNT
OFM OmniForm Form File (Nuance Communications, Inc.)
OFM Embroidery Design File
OFT Outlook Item Template (Microsoft Corporation)
OFX Open Financial Exchange File
OFX Olicom Fax
OGG Origin Graphic File (OriginLab Corporation)
OGG Ogg Vorbis Codec Compressed Multimedia File (Xiph.Org Foundation)
OGM Origin Matrix File (OriginLab Corporation)
OGM Ogg Vorbis Compressed Video File
OLB OrCAD PSpice Capture Symbols Model (Cadence Design Systems, Inc.)
OLB Automation Object Library (Microsoft Corporation)
OLB AUTOGEN
OLD Old Version
OLE Object Linking and Embedding (OLE) Object
OMA Sony OpenMG Music Format File (Sony Corporation of America)
OMF Operation, Management & Finance Database (ENIAC Computing)
OMF Open Media Format File
ONE EdgeCAM Licensing Data Ffile (Pathtrace Engineering Systems)
ONE docPointer Visual ReadMe File (docPointer)
ONE OneNote Note File (Microsoft Corporation)
OPD Durango Interferometry Software Document (Diffraction International)
OPF Gemstar eBook Publisher Package (Gemstar eBook)
OPF Flip Album File
OPF Obsidium Project File (Obsidium Software)
OPT Delphi Project Options (Borland Software Corporation)
OPT Business Integrator Option File (Pervasive Software Inc.)
OPT Options/Configuration
ORF Descent 3 Outrage Room Format
ORF Olympus Digital Camera Raw Image File
ORG Organiser (IBM)
ORG Hollywood FX Effects Organizer File (Pinnacle Systems, Inc.)
ORG Yamaha Organ Flutes (Yamaha Corporation of America)
OSD SoftGrid Program Description (Softricity, Inc.)
OSD Open Software Description File (Microsoft Corporation)
OSD Directory Opus Configuration File (GPSoftware)
OST Exchange Offline File (Microsoft Corporation)
OST Outlook Offline Storage File (Microsoft Corporation)
OST Tivoli Storage Manager File (IBM)
OSX
OTF Open Type Font Format
OTF OpenOffice/StarOffice OpenDocument (Ver 2) Formula Template (Sun Microsystems, Inc.)
OTF Blu-ray Text Subtitle Font Information (Blu-ray Disc Association)
OUT Wireshark Traffic Log (Gerald Combs)
OUT Outlines or Output File
OUT Pro/ENGINEER Temporary File (PTC)
OVE Cakewalk Overture Score (Cakewalk)
OVF
OVL PDP-10 Overlay (Pre-Virtual Memory)
OVL Program File - Overlay
OVL RollerCoaster Tycoon Program Sprite (Infogrames Entertainment SA)

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