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File extensions in alphabetical order #ABCDEFGHIJKLMNOPQRSTUVWXYZ

Browse extensions - O

    File extensions starting with a letter O

Browse extensions - O

# File extension Developer
0 .O - Object Format N/A
1 .O01 - Typhoon Voice FMJ-Software
2 .O2C - Objects To See 3D N/A
3 .O8D - OCTGN Deck N/A
4 .O8G - OCTGN Game Definition N/A
5 .O8O - Mediator 5 Repository Tabs Vorlagen.006 N/A
6 .O8S - OCTGN Set N/A
7 .OAB - Microsoft Outlook Offline Address Book Format N/A
8 .OAD - Suite Notaro Document OA SISTEMI
9 .OAF - Microsoft Flight Simulator Texture Microsoft Studios
10 .OAM - Adobe Edge Overlay Format Adobe Systems
11 .OAP - Samsung Bada Signed Installation Package Samsung Group
12 .OAR - OpenSimulator Archive Format N/A
13 .OAS - Microsoft Outlook Attachment Sniffer rsbr Software
14 .OAT - Google Android RunTime Code Google Inc.
15 .OAV - Microsoft Flight Simulator Texture Microsoft Studios
16 .OAW - OpenArchitectureWare Workflow N/A
17 .OAZ - NetFax Manager OAZ Fax Image N/A
18 .OB - IBM LinkWay Object IBM
19 .OB! - Orbit Downloader Incomplete Download Format Orbit Downloader
20 .OB3 - ABF Software Outlook Backup Backup ABF software, Inc.
21 .OB5 - TopLang OE Backup N/A
22 .OBAK - WinSQL Offline Backup SYNAMETIRCS
23 .OBB - Google Android Opaque Binary Blob Format Google
24 .OBD - Microsoft Office Binder Document Format Microsoft
25 .OBF - OsmAnd Offline GPS Vector Maps OsmAnd Development Project
26 .OBG - ZBrush Mesh Pixologic, Inc.
27 .OBI - Microsoft Outlook 2007/2010/2013 RSS Subscription Format Microsoft
28 .OBJ - 3D Object Format Wavefront Technologies
29 .OBJX - Metatools Object Bryce Support DAZ 3D Inc.
30 .OBK - OrCAD Capture Design Or Library Cadence Design Systems, Inc.
31 .OBL - TrueSpace Caligari Corporation
32 .OBML - Opera Mini Saved Web Page Format Opera Software
33 .OBML15 - Opera Mini 5.1 Saved Web Page Opera Software ASA
34 .OBP - Bryce Object Format DAZ Productions
35 .OBPACK - ObjectBar Theme Pack Stardock Corporation
36 .OBR - Borland C++ Object Browser Data Micro Focus International plc
37 .OBS - WAsP Obstacle List Wind Energy Division at Risø DTU, Denmark
38 .OBT - Openbox Theme Format Openbox
39 .OBV - 3D Photo Browser Thumbnail Cache Mootools software
40 .OBW - Toontrack Superior Drummer Audio Format Toontrack
41 .OBX - Rational XDE IBM
42 .OBYX - Obyx Control Obyx
43 .OBZ - Compressed 3D Object Format Smith Micro
44 .OC3 - OpenCanvas 3 Event Format Portalgraphics
45 .OC4 - OpenCanvas 4 Event Format Portalgraphics
46 .OC5 - OpenCanvas 5 Event Format Portalgraphics
47 .OC9 - OrgCon Organization EcoMerc
48 .OCA - Custom Control Library Type Format Microsoft
49 .OCAMLMAKEFILE - Caml Programming Language Makefile N/A
50 .OCB - Origin Precompiled Origin C OriginLab Corporation
51 .OCC - Oceanic DataPool Format Oceanic Consulting Corporation
52 .OCD - OCAD Digitized Map Format OCAD
53 .OCDC - Mathematica Document Wolfram Research, Inc.
54 .OCDF - OneClickDigital Mp3 Audio Book Recorded Books LLC
55 .OCE - Open Catalog Extension Connection Format Oracle
56 .OCEN - EdGCM Data N/A
57 .OCF - OM2 Cipher OM2 Technology Inc.
58 .OCG - Osprey Custom Graph Mount Sinai Hospital
59 .OCI - OpenCanvas Image Format Portalgraphics
60 .OCM - Netscape Communicator Aim AOL Inc.
61 .OCP - Advanced Art Studio Image N/A
62 .OCR - FaxGrapper FAX Transcribed Text Format Nuance Communications
63 .OCT - RADIANCE Octree Format Radiance
64 .OCTEST - Xcode Objective-C Unit Test Bundle Apple
65 .OCV - OCV Training Data N/A
66 .OCX - ActiveX Control Format Microsoft
67 .OC_ - Compressed ActiveX Control N/A
68 .OD - Mascotte Mascopt Request Format INRIA/UNSA
69 .OD1 - Omnis 5 Database TigerLogic Corp. (Omnis Technology Corporation)
70 .OD2 - Omnis 5 Database TigerLogic Corp. (Omnis Technology Corporation)
71 .OD3 - Omnis Studio Database TigerLogic Corp. (Omnis Technology Corporation)
72 .OD4-9 - Omnis5 Database N/A
73 .ODB - ArcView Object Database ASCII Format OASIS
74 .ODC - OpenOffice.org OpenDocument Format Microsoft
75 .ODCCUBEFILE - OpenDocument 1 N/A
76 .ODCNEWFILE - Microsoft Office Data Connection Microsoft Corporation
77 .ODCTABLEFILE - Microsoft Office Microsoft Corporation
78 .ODE - Microsoft Office Microsoft Corporation
79 .ODEX - Google Android Optimized Executalbe Google Inc.
80 .ODF - Open Document Interchange Format (ODIF) Oracle
81 .ODG - OpenDocument Drawing Format OASIS
82 .ODH - Microsoft Visual Studio Interface Definition Language Microsoft Corporation
83 .ODI - OpenOffice.org Image Format OASIS
84 .ODIF - Open Document Interchange Format ITU-T
85 .ODL - Object Description Language Format Microsoft
86 .ODM - OpenOffice.org OpenDocument Global Text Document Format OverDrive
87 .ODO - ICUBE Online Operating System Write Document Format iCUBE Network Solutions
88 .ODP - OpenOffice.org OpenDocument Presentation Format Oracle
89 .ODS - OpenDocument Spreadsheet Format Oracle
90 .ODT - ODF Text Document Format Oracle
91 .ODT# - OpenOffice.org Locked Document OpenOffice.org Project Team
92 .ODTPC - Oracle User Productivity Kit Presentation Oracle Corporation
93 .ODTTF - Microsoft Office Document Embedded Font Microsoft Corporation
94 .ODV - Ocean Data View Data N/A
95 .ODVI - LaTeX N/A
96 .ODX - Microsoft BizTalk Server Diagram Format Microsoft
97 .OD_ - Oracle Compressed Driver Oracle Corporation
98 .OEACCAOUNT - Windows Mail Microsoft Corporation
99 .OEACCOUNT - Windows Mail Account Settings Format Microsoft
100 .OEB - Open EBook Format QSX
101 .OECL - Open EDA Component Library N/A
102 .OEF - Optim Export IBM
103 .OEM - OEM Install Data Format Microsoft
104 .OEMIGACCOUNT - Outlook Express Temporary Microsoft Corporation
105 .OET - ESignal Order Entry Ticket eSignal
106 .OEX - Opera Add-on Format Opera Software
107 .OFA - Kodak OfotoNow Eastman Kodak Company
108 .OFB - Oxygen Forensic Suite Backup Oxygen Software Company
109 .OFC - Open Financial Connectivity Format Microsoft
110 .OFD - ObjectView Form Definition Cypresslogic Systems Inc.
111 .OFF - DEC 3D Object File Format N/A
112 .OFFICEUI - Microsoft Office UI Customization Microsoft Corporation
113 .OFFSETS - Offset N/A
114 .OFL - OtsTurntables Playlist Ots Labs
115 .OFM - Adobe PostScript Font Description Format Melco
116 .OFN - MS Office File New (Other Office Documents) Microsoft Corporation
117 .OFP - Objecteering Project Objecteering Software
118 .OFR - OptimFROG Encoded Audio OptimFROG
119 .OFS - OptimFROG Dualstream N/A
120 .OFT - Microsoft Outlook Template Format Microsoft
121 .OFX - Open Financial Exchange Format N/A
122 .OGA - Ogg Vorbis Audio Profile Format Xiph.Org
123 .OGD - Oracle Forms Graph Oracle Corporation
124 .OGF - S.T.A.L.K.E.R. Model Format GSC Game World
125 .OGG - Ogg Vorbis Audio Format Xiph.Org
126 .OGL - ATI Overlay Source Code N/A
127 .OGM - Ogg Vorbis Media Format N/A
128 .OGNC - Dynamic Web Page Format N/A
129 .OGO - Origin Graphic Object N/A
130 .OGR - OGR C++ Open Source Library N/A
131 .OGS - Origin Script Format Origons
132 .OGV - Ogg Vorbis Video Format Xiph.Org
133 .OGW - OriginLab Worksheet OriginLab Corporation
134 .OGX - Ogg Vorbis Multiplex Profile Xiph.Org
135 .OGZ - Cube 2 Sauerbraten Map Format Wouter van Oortmerssen
136 .OH - DrillAssistant List N/A
137 .OH4 - Overhoor List Efka-Soft
138 .OHP - MS-DOS 7 Microsoft Corporation
139 .OHS - Bink Outbound History RAD Game Tools, Inc.
140 .OHW - Overhoor DrillAssistant List N/A
141 .OIF - QuickBase Web-sharable Database Interchange Intuit Inc.
142 .OIL - Open Image Library Format Image Format N/A
143 .OJP - 3WayPack N/A
144 .OK - Qedit Robelle
145 .OKM - OkMap Map Defining Gian Paolo Saliola
146 .OKOZO - Okozo Desktop Animation Okozo
147 .OKR - PowerRecover One Key Recovery CyberLink Corp.
148 .OKS - OKScript Mike Mardesich
149 .OKT - Oktalyzer Music Module (MOD) Format N/A
150 .OKX - OKScript Mike Mardesich
151 .OL - Valve Hammer Object Layout Valve Corporation
152 .OLA - Online Access Format N/A
153 .OLB - Microsoft Office OLE Object Library Format Microsoft
154 .OLB2 - CanOpener Library Abbot Systems
155 .OLD - Backup Plus Backup Format N/A
156 .OLE - Microsoft Object Linking And Embedding Microsoft Corporation
157 .OLE2 - Microsoft Office Binary Document Container Format Microsoft Corporation
158 .OLF - OyezForms Legal Documents Oyez Legal Software
159 .OLK - Microsoft Outlook Address Book Format Microsoft
160 .OLK14CATEGORY - Microsoft Outlook 2011 For Mac Category Format Microsoft
161 .OLK14CONTACT - Microsoft Outlook 2011 For Mac Contact Format Microsoft
162 .OLK14DBHEADER - Microsoft Outlook 2011 For Mac Database Microsoft Corporation
163 .OLK14EVENT - Outlook Calendar Event Format Microsoft
164 .OLK14FOLDER - Microsoft Outlook 2011 For Mac Folder Microsoft Corporation
165 .OLK14GROUP - Outlook Group Format Microsoft
166 .OLK14MAILACCOUNT - Microsoft Outlook 2011 For Mac Mail Account Settings Format Microsoft
167 .OLK14MESSAGE - Microsoft Outlook 2011 For Mac Message Format Microsoft
168 .OLK14MSGATTACH - Microsoft Outlook 2011 For Mac Message Attachment Microsoft Corporation
169 .OLK14MSGSOURCE - Microsoft Outlook 2011 For Mac Message Source Format Microsoft
170 .OLK14NOTE - Outlook Note Format Microsoft
171 .OLK14PREF - Microsoft Outlook 2011 For Mac Preferences Format Microsoft
172 .OLK14RECENT - Microsoft Outlook 2011 For Mac Recent Address Microsoft Corporation
173 .OLK14RULE - Microsoft Outlook 2011 For Mac Rule Microsoft Corporation
174 .OLK14SCHEDULE - Microsoft Outlook 2011 For Mac Schedule Microsoft Corporation
175 .OLK14SEARCH - Microsoft Outlook 2011 For Mac Saved Search Microsoft Corporation
176 .OLK14SIGNATURE - Microsoft Outlook 2011 For Mac Signature Format Microsoft
177 .OLK14TASK - Outlook Task Format Microsoft
178 .OLK14UID - Microsoft Outlook 2011 For Mac UID Microsoft Corporation
179 .OLL - TrialDirector Load inData Corporation
180 .OLM - Microsoft Outlook For Mac Data Format Microsoft
181 .OLN - Microsoft Visual C++ Outline Examples Microsoft Corporation
182 .OLPROJ - Adobe OnLocation Adobe Systems Incorporated
183 .OLS - Microsoft Office List Shortcut Microsoft Corporation
184 .OLT - Orbit Downloader Download List Format Orbit Downloader
185 .OLV - Roller Coaster Tycoon Chris Sawyer
186 .OLY - AFP Advanced Function Presentation Overlay Resource IBM
187 .OMA - Sony OpenMG Music Format Sony
188 .OMC - Origin Customized Menu OriginLab Corporation
189 .OMCS - Office Manager Access Format Krekeler
190 .OMD - MapInfo Routing J Server Data Pitney Bowes Software Inc. (MapInfo)
191 .OMEG - Mathematica For Mac Wolfram Research, Inc.
192 .OMF - Open Media Framework Format Avid Technology
193 .OMFI - Open Media Framework N/A
194 .OMG - O&O DiskImage Backup Format O&O Software GmBH
195 .OML - TracePro Model Lambda Research Corporation
196 .OMN - Omnipotent Collection N/A
197 .OMO - OMake Object Format OMake
198 .OMOD - Oblivion Mod Manager Mod Format N/A
199 .OMP - Office Manager Pro Document Archive Krekeler
200 .OMR - OMR Template Abhinav Parihar
201 .OMS - Order Maven Briggs Softworks
202 .OMT - SITH HLA Object Model Template Open Channel Software
203 .OMX - OtsAV Media Library Information Format Ots Labs
204 .ON2 - On2 Encoded FLV N/A
205 .OND - Lotus Notes Format IBM
206 .ONE - Microsoft OneNote Document Format Microsoft
207 .ONECACHE - Microsoft OneNote Cache Microsoft Corporation
208 .ONEPKG - Microsoft OneNote Package Format Microsoft
209 .ONETMP - Microsoft OneNote Temporary Microsoft Corporation
210 .ONETOC - Microsoft OneNote Table Of Contents Microsoft Corporation
211 .ONETOC2 - Microsoft OneNote Table Of Contents Format Microsoft
212 .ONM - Outdoor Navigator Map Maptech, Inc.
213 .ONT - TheWord Module Format theWord Bible Software
214 .ONTX - TheWord Encrypted Module Format theWord Bible Software
215 .ONW - Omron HMI NTST Omron Corporation
216 .ONX - OnyxGrass Image Onyx Computing, Inc.
217 .OO3 - Omni Group Outliner 3 Format The Omni Group
218 .OOG - PyGraph Python Graphics Interface Object Oriented Graphics Python Software Foundation
219 .OOGL - Geomview Object Oriented Graphics Library Geometry Center at the University of Minnesota
220 .OOK - Arachne Batch Script Format Arachne
221 .OOS - OpenOffice.org Spreadsheet OpenOffice.org Project Team
222 .OOT - OpenOffice.org Text OpenOffice.org Project Team
223 .OP - ESignal OptionsPlus eSignal
224 .OP2 - Outpost 2 Saved Game Dynamix, Inc.
225 .OP4 - Nastran Output MSC Software Corporation
226 .OPA - Fly! RAW Image Opacity Map Terminal Reality
227 .OPAL - Microsoft Office Customization Tool (OCT) Language-specific Settings Microsoft Corporation
228 .OPAX - Microsoft Office Customization Tool (OCT) Standard Settings Microsoft Corporation
229 .OPB - Bryce Object DAZ 3D Inc.
230 .OPC - Microsoft Office 97 Upgrade Control Microsoft Corporation
231 .OPD - Durango Interferometry Software Document Format Diffraction International Ltd.
232 .OPDOWNLOAD - Opera Next Incomplete Download Opera Software
233 .OPEF - OmniPass Encrypted Folder Softex Incorporated
234 .OPENBSD - OpenBSD Readme Format N/A
235 .OPF - Open Packaging Format IDPF
236 .OPG - Offline Plan Generation Package N/A
237 .OPI - Adlib OCR Processing Information Adlib Software
238 .OPJ - OrCAD Capture Project Format Cadence Design Systems
239 .OPK - Sinking Island/LIle Noyée Game N/A
240 .OPLC - Nokia Logo Format Nokia
241 .OPLM - Outline Processor Markup Language N/A
242 .OPML - OPML Outline Processor Markup Language File Format N/A
243 .OPN - Court Opinion N/A
244 .OPP - IPhotoDVD Kerensoft
245 .OPPC - Space Marine Game Resource Package Relic Entertainment Inc.
246 .OPQ - Eschalon: Book I Game Basilisk Games
247 .OPR - OPRO X Browser OPRO Japan Co.,Ltd.
248 .OPS - Microsoft Office Profile Settings Format Microsoft
249 .OPT - MySQL Database Data Format N/A
250 .OPTIONS - SE-SOFT Configuration Format SE-SOFT
251 .OPTS - Linux Configuration Options Format N/A
252 .OPUS - Opus Audio Format Xiph.Org
253 .OPW - OrgPlus For Windows Organization Chart Insperity, Inc.
254 .OPX - Microsoft Office Organization Chart File Format Insperity Business Services
255 .OPXT - OrpPlus Template Insperity, Inc.
256 .OPY - OptiY Model OptiY GmbH
257 .OP_ - GKSetup Support GkWare e.K.
258 .OQY - Microsoft Excel OLAP Query Format Microsoft
259 .OR2 - Lotus Organizer 2 Format IBM
260 .OR3 - IBM Lotus Organizer 97 Format IBM
261 .OR4 - Lotus Organizer Data Format IBM
262 .OR5 - IBM Lotus Organizer Format IBM
263 .OR6 - Lotus Organizer Data Format IBM
264 .OR8 - Rational Rose Oracle8 Database Model Report IBM
265 .ORA - Oracle Database Parameter Configuration Format Oracle
266 .ORB - Original EBook Reader Ebook N/A
267 .ORC - CSound Orchestra Midi Format N/A
268 .ORDEREDTEST - Microsoft Visual Studio Ordered Test Format Microsoft
269 .ORE - Ore Executable Format crait
270 .ORF - Olympus Digital Camera Raw Image Format Olympus
271 .ORG - Lotus Organiser Format N/A
272 .ORG2+ - Lotus Organizer IBM
273 .ORI - Original Format N/A
274 .ORIG - Original Format N/A
275 .ORIGINAL - Netobjects Fusion Components Bbscomp Message NetObjects Inc.
276 .ORIGINAL_EPUB - EPUB Ebook Backup N/A
277 .ORIGINAL_MOBI - MOBI Ebook Backup N/A
278 .ORK - Warhammer Mark Of Chaos Game Archive Games Workshop Group PLC
279 .ORL - Object-Relational Language N/A
280 .ORMDESIGNER - ORM Designer Project Inventic s.r.o.
281 .ORS - DSP Group TrueSpeech Audio Format N/A
282 .ORT - COREX Orthographic Transcriptions Format N/A
283 .ORV - Oracom Video Format Oracom
284 .ORX - RadiantOne Virtual Directory Server Database Schema Radiant Logic
285 .ORZ - Holic Game Netgame
286 .OS - ObjectScript Source Format ObjectScript
287 .OS2 - Os2 System IBM
288 .OS3 - OS/2 Warp 3 IBM
289 .OSA - W32/Sober-AD N/A
290 .OSAS - Apple Script Library Tani Script N/A
291 .OSAX - FindFile OSAX Mac Format Type Apple
292 .OSB - OpenStreetMap Binary Map Format Merkaartor
293 .OSBX - OneSafe Exported Backup Lunabee Pte Ltd
294 .OSC - Remote Installation Services Client Installation Wizard Format Microsoft Corporation
295 .OSCD - TouchOSC Interface Editor Template hexler
296 .OSD - Open Software Description Microsoft Corporation
297 .OSDX - Microsoft Windows Search Connector Format Microsoft
298 .OSF - Descent 3 Sound Interplay Entertainment Corporation
299 .OSG - OSGJS JSON Input osg.js
300 .OSK - Osu! Skin Format peppy
301 .OSL - OckamSoft Log Ockam Instruments, Inc.
302 .OSM - OpenStreetMap Data Format OpenStreetMap
303 .OSP - OpenShot Project Format Jonathan Thomas
304 .OSR - Osu! Game Replay Format peppy
305 .OSS - Microsoft Office Saved Search Format Microsoft
306 .OST - Microsoft Outlook Inbox Off-line Folder Format Microsoft
307 .OSU - Osu! Dialog Format peppy
308 .OSW - ONESWING Contents Keisokugiken corporation
309 .OSX - Apple Mac OS PowerPC Executable Format N/A
310 .OSZ - Osu! Beatmap Format peppy
311 .OT - TheWord Text Module Format theWord Bible Software
312 .OTA - OTA Bitmap Format Nokia
313 .OTB - Nokia OTA Bitmap Format Nokia
314 .OTC - OpenDocument Chart Template Format OASIS
315 .OTD - OpenIV Texture Data N/A
316 .OTF - OpenType Font File Format N/A
317 .OTG - OpenOffice.org Graphics Document Template OASIS
318 .OTH - OpenOffice.org OpenDocument HTML Text Template OASIS
319 .OTI - OpenDocument Image Template Format OASIS
320 .OTL - Super NoteTab Template Format Fookes Software
321 .OTLN - Opal Outline Format A Sharp
322 .OTM - Microsoft Outlook Macro Format Microsoft
323 .OTP - OpenOffice.org Presentation Template Format OASIS
324 .OTR - IRIX Complied FTR Silicon Graphics, Inc.
325 .OTRKEY - OTRKEY Encoded Video Format OnlineTvRecorder.com
326 .OTS - OpenOffice.org OpenDocument Spreadsheet Template Format OASIS
327 .OTT - OpenOffice.org Text Document Template Format OASIS
328 .OTV - Rotor-Disc OTV Kit OTV Calibration QIAGEN
329 .OTX - TheWord Encrypted Module Format theWord Bible Software
330 .OTZ - OpenLP Theme Format OpenLP
331 .OUT - Output Format N/A
332 .OUTLINE - FontTwister Letter Outline Neuber Software
333 .OUTLOOK97 - Microsoft Outlook Custom Mail Microsoft Corporation
334 .OUX - Bibexcel Olle Persson
335 .OV - OpenInsight Database Overflow Revelation Software
336 .OV1 - Overlay Microsoft Corporation
337 .OV2 - TomTom Navigator Point Of Interest Format TomTom
338 .OV3 - Overlay Microsoft Corporation
339 .OV4 - Overlay Microsoft Corporation
340 .OV5 - Overlay Microsoft Corporation
341 .OVA - Open Virtual Machine Format VMware
342 .OVD - ObjectVision Data Borland Software Corporation
343 .OVE - Overture Music Score Format GenieSoft
344 .OVF - Open Virtualization Format Package VMware
345 .OVG - ObjectVision Converted Graphic Borland Software Corporation
346 .OVH - OMSI Bus Settings Marcel Kuhnt und Rüdiger Hülsmann
347 .OVL - Overlay Format Atari
348 .OVOLOG - OoVoo Log ooVoo LLC
349 .OVP - The Overlay Maker Package Format The Overlay Maker
350 .OVPN - OpenVPN Config Format OpenVPN Technologies
351 .OVR - Overlay Format The Overlay Maker
352 .OVS - Ovation 1 Style Sheet David Pilling
353 .OVW - Logic Pro Overview Format Apple
354 .OW - Free Pascal For Windows Object Format Free Pascal
355 .OWC - OutWit Hub OutWit Catch Db Format OutWit Technologies
356 .OWG - OutWit Hub OutWit Gear Outwit Thesaurus Db Format OutWit Technologies
357 .OWL - OWL (Obfuscated Weird Language) Source Code Format N/A
358 .OWM - OutWit Hub OutWit Mashup XML Format OutWit Technologies
359 .OWR - PeopleSoft Results Archive Oracle Corporation
360 .OWS - Web Studio Project Beach Software, LLC
361 .OWT - Ancestry.com OneWorldTree Ancestry.com Inc.
362 .OX - Ox Object-Oriented Matrix Programming Language Jurgen A Doornik
363 .OXD - PS3 Proxy Server N/A
364 .OXF - IBM Rational Rhapsody N/A
365 .OXO - Ox Object-Oriented Matrix Programming Language Jurgen A Doornik
366 .OXPS - Windows 8 OpenXPS Document Format Microsoft
367 .OXT - OpenOffice.org Extension Help Format Sun Microsystems
368 .OXYGENE - Oxygene Project Format RemObjects
369 .OYX - IBM Lotus Approach Alternate Database Index Format N/A
370 .OYZ - Lotus Approach Alternate DBASE Index dataBased Intelligence, Inc.
371 .OZ - Opera Job Management Compressed Format Opera Company
372 .OZF2 - OziExplorer Map Des & Lorraine Newman
373 .OZFX3 - OziExplorer Image Des & Lorraine Newman
374 .OZJ - Mu Online Graphic Webzen
375 .OZP - Orgadata LogiKal Orgadata AG
376 .OZT - Mu Online Texture Webzen