| # | Name | File Type |
|---|---|---|
| 1 | O Opener | Compiled Object Format |
| 2 | O01 Opener | Typhoon Voice |
| 3 | O2C Opener | Objects To See 3D |
| 4 | O2S Opener | Oracle To MySQL Converter Data Format |
| 5 | O3D Opener | Google Open 3D Web Graphic Format Format |
| 6 | O8D Opener | OCTGN Deck |
| 7 | O8G Opener | OCTGN Game Definition |
| 8 | O8O Opener | Mediator 5 Repository Tabs Vorlagen.006 |
| 9 | O8S Opener | OCTGN Set |
| 10 | OA Opener | OrCAD PCB Designer OpenAccess Database Format |
| 11 | OAB Opener | Offline Address Book |
| 12 | OAC Opener | Grand Theft Auto V Audio Data Format |
| 13 | OAD Opener | Suite Notaro Document |
| 14 | OAF Opener | Microsoft Flight Simulator Texture |
| 15 | OAM Opener | Adobe Edge Animate Widget Format |
| 16 | OAP Opener | Samsung Bada Signed Installation Package |
| 17 | OAR Opener | OpenSimulator Archive |
| 18 | OAS Opener | Microsoft Outlook Attachment Sniffer |
| 19 | OAT Opener | Google Android RunTime Code |
| 20 | OAV Opener | Microsoft Flight Simulator Texture |
| 21 | OAW Opener | OpenArchitectureWare Workflow |
| 22 | OAZ Opener | NetFax Manager OAZ Fax Image |
| 23 | OB Opener | IBM LinkWay Object |
| 24 | OB! Opener | Orbit Downloader Incomplete Download |
| 25 | OB3 Opener | ABF Software Outlook Backup Backup |
| 26 | OB5 Opener | TopLang OE Backup |
| 27 | OBAK Opener | WinSQL Offline Backup |
| 28 | OBB Opener | Android Opaque Binary Blob Format |
| 29 | OBD Opener | Office Binder Document |
| 30 | OBF Opener | OsmAnd Offline GPS Vector Maps |
| 31 | OBG Opener | ZBrush Mesh |
| 32 | OBI Opener | Outlook RSS Subscription Format |
| 33 | OBJ Opener | Wavefront 3D Object Format |
| 34 | OBJX Opener | Metatools Object Bryce Support |
| 35 | OBK Opener | OrCAD Capture Design Or Library |
| 36 | OBL Opener | TrueSpace |
| 37 | OBM Opener | EIAS Camera Motion Export Format |
| 38 | OBML Opener | Opera Mini Saved Web Page |
| 39 | OBML15 Opener | Opera Mini 5.1 Saved Web Page |
| 40 | OBML16 Opener | Opera Mini Saved Web Page Format |
| 41 | OBP Opener | Bryce Object Format |
| 42 | OBPACK Opener | ObjectBar Theme Pack |
| 43 | OBR Opener | Borland C++ Object Browser Data |
| 44 | OBS Opener | WAsP Obstacle List |
| 45 | OBS-SERVICE Opener | Open Broadcaster Software Data Format |
| 46 | OBSKIN Opener | ObjectBar Skin Format |
| 47 | OBT Opener | Openbox Theme Format |
| 48 | OBV Opener | 3D Photo Browser Thumbnail Cache |
| 49 | OBW Opener | Superior Drummer Sounds Format |
| 50 | OBX Opener | Rational XDE |
| 51 | OBYX Opener | Obyx Control |
| 52 | OBZ Opener | Compressed 3D Object Format |
| 53 | OC3 Opener | OpenCanvas 3 Event Format |
| 54 | OC4 Opener | OpenCanvas 4 Event Format |
| 55 | OC5 Opener | OpenCanvas 5 Event Format |
| 56 | OC9 Opener | OrgCon Organization |
| 57 | OCA Opener | Custom Control Library Type Format |
| 58 | OCAMLMAKEFILE Opener | Caml Programming Language Makefile |
| 59 | OCB Opener | Origin Precompiled Origin C |
| 60 | OCC Opener | Oceanic DataPool Format |
| 61 | OCD Opener | OCAD Map Format |
| 62 | OCDC Opener | Mathematica Document |
| 63 | OCDF Opener | OneClickDigital Mp3 Audio Book |
| 64 | OCE Opener | Open Catalog Extension Connection Format |
| 65 | OCEN Opener | EdGCM Data |
| 66 | OCF Opener | OM2 Cipher |
| 67 | OCG Opener | Osprey Custom Graph |
| 68 | OCI Opener | OpenCanvas Image |
| 69 | OCL Opener | Object Constraint Language Data Format |
| 70 | OCM Opener | Netscape Communicator Aim |
| 71 | OCO Opener | Open Color Format Palette Format |
| 72 | OCP Opener | Advanced Art Studio Image |
| 73 | OCR Opener | FAXGrapper Fax Text Format |
| 74 | OCREC Opener | Microsoft Lync Data Format |
| 75 | OCSP Opener | HAProxy OCSP Data Format |
| 76 | OCT Opener | Radiance Octree Format |
| 77 | OCTEST Opener | Xcode Objective-C Unit Test Bundle |
| 78 | OCV Opener | OCV Training Data |
| 79 | OCX Opener | ActiveX Control |
| 80 | OC_ Opener | Compressed ActiveX Control |
| 81 | OD Opener | Mascopt Graph Request Format |
| 82 | OD1 Opener | Omnis 5 Database |
| 83 | OD2 Opener | Omnis 5 Database |
| 84 | OD3 Opener | Omnis Studio Database |
| 85 | OD4-9 Opener | Omnis5 Database |
| 86 | OD5 Opener | Omnis 5 Database Format |
| 87 | ODA Opener | CALS Group IV Type 2 Raster Image Format |
| 88 | ODB Opener | OpenDocument Database |
| 89 | ODC Opener | Office Data Connection Format |
| 90 | ODCCUBEFILE Opener | OpenDocument 1 |
| 91 | ODCDATABASEFILE Opener | Microsoft Office Data Format |
| 92 | ODCNEWFILE Opener | Microsoft Office Data Connection |
| 93 | ODCODC Opener | ODCODC Ransomware Affected Format |
| 94 | ODCTABLECOLLECTIONFILE Opener | Microsoft Office Component Format |
| 95 | ODCTABLEFILE Opener | Microsoft Office |
| 96 | ODE Opener | Microsoft Office |
| 97 | ODEX Opener | Google Android Optimized Executalbe |
| 98 | ODF Opener | OpenDocument Formula |
| 99 | ODG Opener | OpenDocument Graphic Format |
| 100 | ODH Opener | Microsoft Visual Studio Interface Definition Language |
| 101 | ODI Opener | OpenDocument Image |
| 102 | ODIF Opener | Open Document Interchange Format |
| 103 | ODL Opener | Object Description Language Format |
| 104 | ODM Opener | OverDrive Media Format |
| 105 | ODO Opener | Online Operating System Write Document |
| 106 | ODP Opener | OpenDocument Presentation |
| 107 | ODR Opener | HMI Builder Report Format |
| 108 | ODS Opener | OpenDocument Spreadsheet |
| 109 | ODT Opener | OpenDocument Text Document |
| 110 | ODT# Opener | OpenOffice.org Locked Document |
| 111 | ODTPC Opener | Oracle User Productivity Kit Presentation |
| 112 | ODTTF Opener | Microsoft Office Document Embedded Font |
| 113 | ODV Opener | Ocean Data View Data |
| 114 | ODVI Opener | LaTeX |
| 115 | ODX Opener | BizTalk Server Orchestration Format |
| 116 | OD_ Opener | Oracle Compressed Driver |
| 117 | OEACCAOUNT Opener | Windows Mail |
| 118 | OEACCOUNT Opener | Windows Mail Account Format |
| 119 | OEB Opener | Outlook Express Backup Wizard Format |
| 120 | OECL Opener | Open EDA Component Library |
| 121 | OEF Opener | Optim Export |
| 122 | OEM Opener | OEM Setup Format |
| 123 | OEMIGACCOUNT Opener | Outlook Express Temporary |
| 124 | OER Opener | AU OER TOOLS Project Format |
| 125 | OET Opener | ESignal Order Entry Ticket |
| 126 | OETPL Opener | Offline Explorer Format |
| 127 | OEX Opener | Opera Extension |
| 128 | OFA Opener | Kodak OfotoNow |
| 129 | OFB Opener | Oxygen Forensic Suite Backup |
| 130 | OFC Opener | Open Financial Connectivity Format |
| 131 | OFD Opener | ObjectView Form Definition |
| 132 | OFF Opener | Object Format Format |
| 133 | OFFICEUI Opener | Microsoft Office UI Customization |
| 134 | OFFSETS Opener | Offset |
| 135 | OFL Opener | Ots Format List |
| 136 | OFM Opener | Melco Embroidery Format |
| 137 | OFN Opener | MS Office Format New (Other Office Documents) |
| 138 | OFP Opener | Objecteering Project |
| 139 | OFR Opener | OptimFROG Audio Format |
| 140 | OFS Opener | OptimFROG Dualstream |
| 141 | OFT Opener | Outlook Format Template |
| 142 | OFX Opener | Open Financial Exchange Format |
| 143 | OGA Opener | Ogg Vorbis Audio Format |
| 144 | OGD Opener | Oracle Forms Graph |
| 145 | OGEX Opener | Open Game Engine Exchange Data Format |
| 146 | OGF Opener | S.T.A.L.K.E.R. Model Format |
| 147 | OGG Opener | Ogg Vorbis Audio Format |
| 148 | OGL Opener | ATI Overlay Source Code |
| 149 | OGM Opener | Ogg Media Format |
| 150 | OGNC Opener | Dynamic Web Page |
| 151 | OGO Opener | Origin Graphic Object |
| 152 | OGR Opener | OGR C++ Open Source Library |
| 153 | OGRE Opener | OGRE 3D Data Format |
| 154 | OGS Opener | Origons Movie Data Format |
| 155 | OGV Opener | Ogg Video Format |
| 156 | OGW Opener | OriginLab Worksheet |
| 157 | OGX Opener | Ogg Vorbis Multiplexed Media Format |
| 158 | OGZ Opener | Cube 2 Map Format |
| 159 | OH Opener | DrillAssistant List |
| 160 | OH4 Opener | Overhoor List |
| 161 | OHP Opener | MS-DOS 7 |
| 162 | OHS Opener | Bink Outbound History |
| 163 | OHT Opener | Oracle Help For Java Links Data Format |
| 164 | OHW Opener | Overhoor DrillAssistant List |
| 165 | OIF Opener | QuickBase Web-sharable Database Interchange |
| 166 | OIL Opener | Open Image Library Format Image Format |
| 167 | OIV Opener | OpenIV Mod Archive Format |
| 168 | OJP Opener | 3WayPack |
| 169 | OK Opener | Qedit |
| 170 | OKD Opener | Lenovo OneKey Recovery Data Format |
| 171 | OKM Opener | OkMap Map Defining |
| 172 | OKOZO Opener | Okozo Desktop Animation |
| 173 | OKR Opener | PowerRecover One Key Recovery |
| 174 | OKS Opener | OKScript |
| 175 | OKT Opener | Oktalyzer Module |
| 176 | OKX Opener | OKScript |
| 177 | OL Opener | Valve Hammer Object Layout |
| 178 | OLA Opener | Online Access Format |
| 179 | OLB Opener | OLE Object Library |
| 180 | OLB2 Opener | CanOpener Library |
| 181 | OLD Opener | Backup Format |
| 182 | OLE Opener | Microsoft Object Linking And Embedding |
| 183 | OLE2 Opener | Microsoft Office Binary Document Container Format |
| 184 | OLF Opener | OyezForms Legal Documents |
| 185 | OLG Opener | Orbit Legend Data Format |
| 186 | OLK Opener | Outlook Address Book Format |
| 187 | OLK14 Opener | Microsoft Outlook For Mac Message Format |
| 188 | OLK14ARRANGE Opener | Microsoft Outlook 2011 For Mac Data Format |
| 189 | OLK14CALATTACH Opener | Microsoft Outlook 2011 For Mac Data Format |
| 190 | OLK14CATEGORY Opener | Outlook Category Format |
| 191 | OLK14CONTACT Opener | Outlook Contact Format |
| 192 | OLK14DBHEADER Opener | Microsoft Outlook 2011 For Mac Database |
| 193 | OLK14EVENT Opener | Outlook Calendar Event Format |
| 194 | OLK14EXACCOUNT Opener | Microsoft Outlook 2011 For Mac Data Format |
| 195 | OLK14EXMOVES Opener | Microsoft Outlook 2011 For Mac Data Format |
| 196 | OLK14EXSYNCMAP Opener | Microsoft Outlook 2011 For Mac Data Format |
| 197 | OLK14FOLDER Opener | Microsoft Outlook 2011 For Mac Folder |
| 198 | OLK14GROUP Opener | Outlook Group Format |
| 199 | OLK14IMAPSYNCMAP Opener | Microsoft Outlook 2011 For Mac Data Format |
| 200 | OLK14MAILACCOUNT Opener | Outlook Mail Account Format |
| 201 | OLK14MESSAGE Opener | Outlook Message Format |
| 202 | OLK14MSGATTACH Opener | Microsoft Outlook 2011 For Mac Message Attachment |
| 203 | OLK14MSGSOURCE Opener | Outlook Email Message Data Format |
| 204 | OLK14NOTE Opener | Outlook Note Format |
| 205 | OLK14PREF Opener | Outlook Preferences Format |
| 206 | OLK14RECENT Opener | Microsoft Outlook 2011 For Mac Recent Address |
| 207 | OLK14RULE Opener | Microsoft Outlook 2011 For Mac Rule |
| 208 | OLK14SCHEDULE Opener | Microsoft Outlook 2011 For Mac Schedule |
| 209 | OLK14SEARCH Opener | Microsoft Outlook 2011 For Mac Saved Search |
| 210 | OLK14SIGNATURE Opener | Outlook Signature Format |
| 211 | OLK14TASK Opener | Outlook Task Format |
| 212 | OLK14UID Opener | Microsoft Outlook 2011 For Mac UID |
| 213 | OLK15MESSAGE Opener | Microsoft Outlook For Mac Message Format |
| 214 | OLL Opener | TrialDirector Load |
| 215 | OLM Opener | Mac Outlook Database Format |
| 216 | OLN Opener | Microsoft Visual C++ Outline Examples |
| 217 | OLPROJ Opener | Adobe OnLocation |
| 218 | OLR Opener | Openlab RAW Image Format |
| 219 | OLS Opener | Microsoft Office List Shortcut |
| 220 | OLT Opener | Orbit Downloads List |
| 221 | OLV Opener | Roller Coaster Tycoon |
| 222 | OLY Opener | AFP Advanced Function Presentation Overlay Resource |
| 223 | OMA Opener | Sony OpenMG Music Format |
| 224 | OMC Opener | Origin Customized Menu |
| 225 | OMCS Opener | Office Manager Access Format |
| 226 | OMD Opener | MapInfo Routing J Server Data |
| 227 | OME Opener | Open Microscopy Environment OME Image Format |
| 228 | OMEG Opener | Mathematica For Mac |
| 229 | OMF Opener | Open Media Framework Format |
| 230 | OMFI Opener | Open Media Framework |
| 231 | OMG Opener | O&O DiskImage Backup Format |
| 232 | OMI Opener | Orbit Multiresolution Image Format |
| 233 | OMK Opener | Ocera Make System Script Format |
| 234 | OML Opener | TracePro Model |
| 235 | OMLOG Opener | CA OM Web Viewer Log Format |
| 236 | OMN Opener | Omnipotent Collection |
| 237 | OMO Opener | OMake Object Format |
| 238 | OMOD Opener | Oblivion Mod Archive |
| 239 | OMP Opener | Office Manager Document Archive |
| 240 | OMR Opener | OMR Template |
| 241 | OMS Opener | Order Maven |
| 242 | OMT Opener | SITH HLA Object Model Template |
| 243 | OMU Opener | XWE Data Format |
| 244 | OMX Opener | OtsAV Media Library Information Format |
| 245 | ON2 Opener | On2 Encoded FLV |
| 246 | ONB Opener | OpenModelica Document Format |
| 247 | ONBATCH Opener | ON1 Photo Data Format |
| 248 | OND Opener | Lotus Notes Encapsulated Memo Format |
| 249 | ONE Opener | OneNote Document |
| 250 | ONEBIN Opener | OneNote Data Format |
| 251 | ONECACHE Opener | Microsoft OneNote Cache |
| 252 | ONEFFECTS Opener | Perfect Effects Data Format |
| 253 | ONENHANCE Opener | Perfect Effects Data Format |
| 254 | ONEPASSWORD-LICENSE Opener | 1Password License Format |
| 255 | ONEPKG Opener | Microsoft OneNote Package Format |
| 256 | ONEPKG_1033 Opener | Microsoft Update Data Format |
| 257 | ONETMP Opener | Microsoft OneNote Temporary |
| 258 | ONETOC Opener | Microsoft OneNote Table Of Contents |
| 259 | ONETOC2 Opener | Microsoft OneNote Table Of Contents Format |
| 260 | ONEXPORT Opener | ON1 Photo Data Format |
| 261 | ONM Opener | Outdoor Navigator Map |
| 262 | ONPORTRAIT Opener | ON1 Photo Data Format |
| 263 | ONPORTRAITFD Opener | Perfect Effects Data Format |
| 264 | ONPRESET Opener | Perfect Effects Preset Format |
| 265 | ONRESIZE Opener | Perfect Effects Data Format |
| 266 | ONT Opener | TheWord Bible Text Module |
| 267 | ONTX Opener | TheWord Encrypted Bible Text Module |
| 268 | ONW Opener | Omron HMI NTST |
| 269 | ONX Opener | OnyxGrass Image |
| 270 | OO3 Opener | OmniOutliner 3 Format |
| 271 | OOA Opener | OOA Interchange Format Data Format |
| 272 | OOC Opener | CHARTrunner Definition Data Format |
| 273 | OODAGTDAT Opener | O&O Defrag Binary Report Format |
| 274 | OODAGTID Opener | O&O Defrag Binary Report Format |
| 275 | OODAGTRPD Opener | O&O Defrag Binary Report Format |
| 276 | OODBRI Opener | O&O Defrag Binary Report Format |
| 277 | OODBRP Opener | O&O Defrag GUI Settings Format |
| 278 | OODGUISETTINGS Opener | O&O Defrag GUI Settings Format |
| 279 | OOG Opener | PyGraph Python Graphics Interface Object Oriented Graphics |
| 280 | OOGL Opener | Geomview Object Oriented Graphics Library |
| 281 | OOK Opener | Arachne Batch Script |
| 282 | OOL Opener | Orbit Object List Format |
| 283 | OOPS Opener | Oops Format |
| 284 | OOS Opener | OpenOffice.org Spreadsheet |
| 285 | OOT Opener | OpenOffice.org Text |
| 286 | OP Opener | ESignal OptionsPlus |
| 287 | OP2 Opener | Outpost 2 Saved Game |
| 288 | OP4 Opener | Nastran Output |
| 289 | OPA Opener | Fly! RAW Image Opacity Map |
| 290 | OPAL Opener | Microsoft Office Customization Tool (OCT) Language-specific Settings |
| 291 | OPAX Opener | Microsoft Office Customization Tool (OCT) Standard Settings |
| 292 | OPB Opener | Bryce Object |
| 293 | OPC Opener | Microsoft Office 97 Upgrade Control |
| 294 | OPCSES Opener | Opticodec-PC Data Format |
| 295 | OPD Opener | Durango Interferometry Software Document Format |
| 296 | OPDOWNLOAD Opener | Opera Partially Downloaded Format |
| 297 | OPEF Opener | OmniPass Encrypted Folder |
| 298 | OPENBSD Opener | OpenBSD Readme Format |
| 299 | OPF Opener | Open Packaging Format Format |
| 300 | OPG Opener | Offline Plan Generation Package |
| 301 | OPI Opener | Adlib OCR Processing Information |
| 302 | OPJ Opener | OrCAD Project Format |
| 303 | OPK Opener | Sinking Island/LIle Noyée Game |
| 304 | OPLC Opener | Nokia Operator Logo Format |
| 305 | OPLM Opener | Outline Processor Markup Language |
| 306 | OPLX Opener | Omniplan Project Document Format |
| 307 | OPML Opener | Outline Processor Markup Language Format |
| 308 | OPN Opener | Court Opinion |
| 309 | OPP Opener | IPhotoDVD |
| 310 | OPPC Opener | Space Marine Game Resource Package |
| 311 | OPPO Opener | Oppo Core Data Format |
| 312 | OPQ Opener | Eschalon: Book I Game |
| 313 | OPR Opener | OPRO X Browser |
| 314 | OPRC Opener | Palm OS Data Format |
| 315 | OPS Opener | Office Profile Settings Format |
| 316 | OPSX Opener | Open Pedigree Standard Exchange Document Format |
| 317 | OPT Opener | MySQL Database Data Format |
| 318 | OPTIONS Opener | SE-SOFT Configuration Format |
| 319 | OPTS Opener | Linux Configuration Options Format |
| 320 | OPUS Opener | Opus Audio Format |
| 321 | OPUSCERT Opener | Directory Opus Certificate Format |
| 322 | OPW Opener | OrgPlus For Windows Organization Chart |
| 323 | OPX Opener | OrgPlus Org Chart |
| 324 | OPXT Opener | OrpPlus Template |
| 325 | OPY Opener | OptiY Model |
| 326 | OP_ Opener | GKSetup Support |
| 327 | OQY Opener | Excel OLAP Query Format |
| 328 | OR2 Opener | Lotus Organizer 2 Format |
| 329 | OR3 Opener | IBM Lotus Organizer 97 Format |
| 330 | OR4 Opener | IBM Lotus Organizer 97 GS Format |
| 331 | OR5 Opener | Lotus Organizer 5 Format |
| 332 | OR6 Opener | Lotus Organizer 6 Format |
| 333 | OR8 Opener | Rational Rose Oracle8 Database Model Report |
| 334 | ORA Opener | Oracle Database Configuration Format |
| 335 | ORB Opener | Original EBook Reader Ebook |
| 336 | ORC Opener | CSound Orchestra Midi Format |
| 337 | ORD Opener | OMAX Routed Data Format |
| 338 | ORDEREDTEST Opener | Visual Studio Ordered Test Format |
| 339 | ORE Opener | Ore Executable Format |
| 340 | ORF Opener | Olympus RAW Format |
| 341 | ORG Opener | Lotus Organizer Format |
| 342 | ORG2+ Opener | Lotus Organizer |
| 343 | ORI Opener | Original Format |
| 344 | ORIG Opener | Original Format |
| 345 | ORIGINAL Opener | Netobjects Fusion Components Bbscomp Message |
| 346 | ORIGINAL_EPUB Opener | EPUB Ebook Backup |
| 347 | ORIGINAL_MOBI Opener | MOBI Ebook Backup |
| 348 | ORK Opener | Warhammer Mark Of Chaos Game Archive |
| 349 | ORL Opener | Object-Relational Language |
| 350 | ORMDESIGNER Opener | ORM Designer Project |
| 351 | ORP Opener | WinSLAM Data Format |
| 352 | ORS Opener | DSP Group TrueSpeech Audio Format |
| 353 | ORT Opener | COREX Orthographic Transcriptions Format |
| 354 | ORV Opener | Oracom Video Format |
| 355 | ORX Opener | RadiantOne VDS Database Schema |
| 356 | ORY Opener | Sage ACT! Data Format |
| 357 | ORZ Opener | Holic Game |
| 358 | OS Opener | ObjectScript Source Format |
| 359 | OS2 Opener | Os2 System |
| 360 | OS3 Opener | OS/2 Warp 3 |
| 361 | OSA Opener | W32/Sober-AD |
| 362 | OSAS Opener | Apple Script Library Tani Script |
| 363 | OSAX Opener | FindFile OSAX Mac Format Type |
| 364 | OSB Opener | OpenStreetMap Binary Map Format |
| 365 | OSBX Opener | OneSafe Exported Backup |
| 366 | OSC Opener | Remote Installation Services Client Installation Wizard Format |
| 367 | OSCD Opener | TouchOSC Interface Editor Template |
| 368 | OSD Opener | Open Software Description |
| 369 | OSDX Opener | Search Connector Description Format |
| 370 | OSF Opener | Descent 3 Sound |
| 371 | OSG Opener | OSGJS JSON Input |
| 372 | OSGB Opener | OpenSceneGraph Binary Scene Data Format |
| 373 | OSGT Opener | OpenSceneGraph ASCII Scene Data Format |
| 374 | OSH Opener | IBM InfoSphere Schema Format |
| 375 | OSINSTALLMESSAGES Opener | MacOS System Data Format |
| 376 | OSK Opener | Osu! Skin Format |
| 377 | OSL Opener | OckamSoft Log |
| 378 | OSM Opener | OpenStreetMap Map Format |
| 379 | OSN Opener | Open Symbolic Notation Data Format |
| 380 | OSP Opener | OpenShot Project Format |
| 381 | OSPX Opener | Dell KACE Patch Definition Format |
| 382 | OSR Opener | Osu! Replay Format |
| 383 | OSS Opener | Microsoft Outlook Saved Search Format |
| 384 | OST Opener | Outlook Offline Folder Format |
| 385 | OSU Opener | Osu! Script |
| 386 | OSW Opener | ONESWING Contents |
| 387 | OSX Opener | PowerPC Executable Format |
| 388 | OSZ Opener | Osu! Beatmap Format |
| 389 | OT Opener | TheWord Old Testament Text Module |
| 390 | OTA Opener | OTA Bitmap Image |
| 391 | OTB Opener | Nokia Over The Air Bitmap Image |
| 392 | OTC Opener | OpenDocument Chart Template |
| 393 | OTD Opener | OpenIV Texture Data |
| 394 | OTF Opener | OpenType Font |
| 395 | OTG Opener | OpenDocument Graphic Template |
| 396 | OTH Opener | OpenDocument HTML Template |
| 397 | OTI Opener | OpenDocument Image Template |
| 398 | OTL Opener | NoteTab Outline Format |
| 399 | OTLN Opener | Opal Outline Format |
| 400 | OTM Opener | Outlook Macro Format |
| 401 | OTN Opener | OmniPage Pro Training Data Format |
| 402 | OTO Opener | AutoPano Project Format |
| 403 | OTP Opener | OpenDocument Presentation Template |
| 404 | OTR Opener | IRIX Complied FTR |
| 405 | OTRKEY Opener | OnlineTvRecorder Encoded Video Format |
| 406 | OTS Opener | OpenDocument Spreadsheet Template |
| 407 | OTT Opener | OpenDocument Document Template |
| 408 | OTV Opener | Rotor-Disc OTV Kit OTV Calibration |
| 409 | OTVDATAFILE Opener | OnlineTV Data Format |
| 410 | OTW Opener | Origin Worksheet Template Format |
| 411 | OTX Opener | TheWord Encrypted Old Testament Text Module |
| 412 | OTZ Opener | OpenLP Theme Format |
| 413 | OUT Opener | Output Format |
| 414 | OUT1 Opener | UltraEdit Data Format |
| 415 | OUTJOB Opener | Altium Designer Data Format |
| 416 | OUTLINE Opener | FontTwister Letter Outline |
| 417 | OUTLOOK97 Opener | Microsoft Outlook Custom Mail |
| 418 | OUV Opener | Sphinx Open Ended Responses Format |
| 419 | OUX Opener | Bibexcel |
| 420 | OV Opener | OpenInsight Database Overflow |
| 421 | OV1 Opener | Overlay |
| 422 | OV2 Opener | TomTom Points Of Interest Database |
| 423 | OV3 Opener | Overlay |
| 424 | OV4 Opener | Overlay |
| 425 | OV5 Opener | Overlay |
| 426 | OVA Opener | Open Virtual Appliance |
| 427 | OVD Opener | ObjectVision Data |
| 428 | OVE Opener | Overture Musical Score |
| 429 | OVF Opener | Open Virtualization Format |
| 430 | OVG Opener | ObjectVision Converted Graphic |
| 431 | OVH Opener | OMSI Bus Settings |
| 432 | OVISUITE Opener | Nokia Ovi Suite Data Format |
| 433 | OVK Opener | Little Busters! Game Data Format |
| 434 | OVL Opener | Rollercoaster Tycoon 3 Data Format |
| 435 | OVLX Opener | E-Sword Overlay Data Format |
| 436 | OVOLOG Opener | OoVoo Log |
| 437 | OVP Opener | The Overlay Maker Package Format |
| 438 | OVPN Opener | OpenVPN Configuration Format |
| 439 | OVR Opener | The Overlay Maker Overlay Format |
| 440 | OVS Opener | Ovation 1 Style Sheet |
| 441 | OVT Opener | Orbit Vector Tiled Format |
| 442 | OVW Opener | Logic Pro Overview Format |
| 443 | OW Opener | Free Pascal 1.0.x Object Format |
| 444 | OWC Opener | OutWit Catch Database |
| 445 | OWFS Opener | Web Feature Service Data Format |
| 446 | OWG Opener | OutWit Gear Database |
| 447 | OWL Opener | OWL Source Code Format |
| 448 | OWM Opener | OutWit XML Mashup Format |
| 449 | OWR Opener | PeopleSoft Results Archive |
| 450 | OWS Opener | Web Studio Project |
| 451 | OWT Opener | Ancestry.com OneWorldTree |
| 452 | OWX Opener | OutWit Hub Script Format |
| 453 | OX Opener | Ox Object-Oriented Matrix Programming Language |
| 454 | OXD Opener | PS3 Proxy Server |
| 455 | OXF Opener | IBM Rational Rhapsody |
| 456 | OXO Opener | Ox Object-Oriented Matrix Programming Language |
| 457 | OXPS Opener | OpenXPS Format |
| 458 | OXS Opener | Racer Onyx Script Format |
| 459 | OXT Opener | Apache OpenOffice Extension |
| 460 | OXYGENE Opener | Oxygene Project Format |
| 461 | OYX Opener | Approach Alternate Database Index |
| 462 | OYZ Opener | Lotus Approach Alternate DBASE Index |
| 463 | OZ Opener | Opera Job Management Compressed Format |
| 464 | OZD Opener | Win32.TrojanDownloader.Agent.OZD Trojan Format |
| 465 | OZF2 Opener | OziExplorer Map |
| 466 | OZFX3 Opener | OziExplorer Image |
| 467 | OZJ Opener | Mu Online Graphic |
| 468 | OZP Opener | Orgadata LogiKal |
| 469 | OZT Opener | Mu Online Texture |
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