OR8 - OTO
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- OR8 - Rational Rose Oracle8 Database Model Report (IBM)
- OR8 - Rational Rose Oracle8 database model report
- ORA - Parameter file (Oracle)
- ORA - Configuration file (Oracle 7)
- ORB - Unknown or unassigned file extension
- ORC - Script (Oracle 7)
- ORD - Bc45 Owl file
- ORD - Open Reminder database file
- ORD - OMAX Routed Data File
- ORDEREDTEST - Microsoft Visual Studio ordered test file
- ORE - 3WayPack (The Three - Mode Company )
- ORE - Narbacular Drop Game Content ( DigiPen Corporation )
- ORF - A RAW Image File
- ORF - Olympus digital camera RAW image Header
- ORF - Descent 3 Outrage Room Format
- ORF - Olympus Digital Camera Raw Image File
- ORF - Olympus Raw File
- ORG - Calendar file (Lotus Organizer)
- ORI - Original File
- ORI - Need for Speed -Hot Pursuit 2 File
- ORIG - Generic original file
- ORIG - Gen original file
- ORIGINAL - Netobjects fusion Components Bbscomp message file
- ORK - Warhammer Mark of Chaos game archive
- ORM - Ormetis Workbench File ( Ormetis S.A.S.)
- ORMV - Ormetis View File ( Ormetis S.A.S.)
- ORO - 3WayPack (The Three - Mode Company )
- ORS - DSP Group TrueSpeech Audio format file
- ORT - COREX orthographic transcriptions file
- ORT - Rich Text Editor Document
- ORX - RadiantOne VDS Database Schema
- OS3 - OS/2 Warp 3 File
- OS3 - Os2warp3 file
- OSAX - Mac File Type
- OSB - Sega Dreamcast Sound (One Shot Bank ) ( Sega of America Inc.)
- OSC - Fruitypro Samples Ss_ effects file
- OSC - Remote Installation Services Client Installation Wizard File ( Microsof...
- OSC - OptionScope worksheet file
- OSC - Formula One 2001 Options File
- OSD - driver file
- OSD - OSD4 data file
- OSD - Open Software Description File ( Microsoft Corporation )
- OSD - SoftGrid program description
- OSD - Directory Opus Configuration File ( GPSoftware )
- OSDX - Windows Search Connector ( Microsoft Corporation )
- OSF - Opera skin file
- OSF - Dist Bin file
- OSF - ICZ OriSAFE
- OSF - Descent 3 Sound File ( Outrage Entertainment )
- OSF - Virtual Ticket file
- OSF - Distribution bin file
- OSG - OpenSceneGraph ASCII Native Format (OSG Community )
- OSI - SunNet OSI Description File (Sun)
- OSI - Osiris Database (The Shmoo Group )
- OSL - OckamSoft Log File ( Ockam Instruments Inc.)
- OSM - OpenStreetMap XML Data Header
- OSP - Obi Synth Pack Music Header
- OSP - On Screen Takeoff file
- OSP - CWCDATA file
- OSS - Search file (Microsoft Office)
- OST - Offline file (Microsoft Exchange/Outlook)
- OSX - OSW external file
- OSZ - OSU Beatmap File ( Zipped )
- OT - Atari Jaguar (TOM) object code
- OTAN - Mac File Type
- OTB - Nokia OTA bitmap file
- OTB - On-the-air Bitmap
- OTB - Nokia Over The Air Bitmap
- OTC - OpenDocument Chart Template
- OTC - OpenDocument chart template file
- OTF - OpenType Font
- OTF - Blu-ray Text Subtitle Font Information (Blu-ray Disc Association )
- OTF - OpenOffice / StarOffice OpenDocument (Ver 2) Formula Template (Sun Micr...
- OTF - OpenTuft Tufting Design File
- OTF - OpenType font file format
- OTF - OpenDocument Formula Template
- OTF - OnkoS Text Data File
- OTG - OpenDocument Graphic Template
- OTGL - Mac File Type
- OTH - OpenDocument HTML document template - OpenOffice.org
- OTH - Microsoft PowerToys Explorer tool
- OTH - Power Toys Other Folder Explorer Tool
- OTH - OpenOffice.org OpenDocument HTML text template
- OTH - Origin Graph Properties File ( OriginLab Corporation )
- OTHERFOLDER - Power Toys Other Folder Explorer Tool
- OTI - OpenDocument Image Template
- OTL - Template file (PrintMaster Gold)
- OTL - Template file (Super NoteTab) (Fookes)
- OTL - Outline font description (Z-Soft Type Foundry)
- OTLN - Opal Outline File
- OTM - Unknown Apple II File
- OTM - Micro Cookbook File ( IMSI / Design LLC)
- OTM - Outlook Macro File
- OTN - OmniPage Training File ( Nuance Communications Inc.)
- OTNC - Mac File Type
- OTO - Autopano Project ( Alexandre Jenny )
- OTOSET - OTOsuite Settings (GN Otometrics )
