.O | Microsoft Corporation | File sviluppatore | Compiled Object File | Microsoft Visual Studio | Microsoft Corporation |
.OAB | Microsoft Corporation | File di dati | Offline Address Book | Microsoft Outlook | Microsoft Corporation |
.OBD | Microsoft Corporation | File di dati | Office Binder Document | Microsoft Office | Microsoft Corporation |
.OBI | Microsoft Corporation | File di settaggi | Outlook RSS Subscription File | Microsoft Outlook 2016 | Microsoft Corporation |
.OBT | Open Source | File di settaggi | Openbox Theme File | Microsoft Binder | Microsoft Corporation |
.OCA | Microsoft Corporation | File sviluppatore | Custom Control Library Type File | Microsoft Visual Basic | Microsoft Corporation |
.OCR | URUWORKS | File vari | Subtitle Workshop OCR Script | Microsoft Notepad | Microsoft Corporation |
.OCSMEET | Microsoft Corporation | File di dati | Microsoft Lync Data | Microsoft Lync | Microsoft Corporation |
.OCX | Microsoft Corporation | File sviluppatore | ActiveX Control | Microsoft Visual Studio | Microsoft Corporation |
.OC_ | Microsoft Corporation | File compressi | Compressed ActiveX Control File | Microsoft Windows | Microsoft Corporation |
.ODC | Microsoft Corporation | File di settaggi | Office Data Connection File | Microsoft Excel | Microsoft Corporation |
.ODCDATABASEFILE | Microsoft Corporation | File di dati | Microsoft Office File | Microsoft Office | Microsoft Corporation |
.ODCTABLECOLLECTIONFILE | Microsoft Corporation | File di dati | Microsoft Office Component | Microsoft Office | Microsoft Corporation |
.ODCTABLEFILE | Microsoft Corporation | File di dati | Microsoft Office File | Microsoft Office | Microsoft Corporation |
.ODF | Oracle Corporation | File vari | OpenDocument Formula | Microsoft Notepad | Microsoft Corporation |
.ODL | Microsoft Corporation | File sviluppatore | Object Description Language File | Microsoft Visual Studio | Microsoft Corporation |
.ODP | Oracle Corporation | File di dati | OpenDocument Presentation | Microsoft PowerPoint | Microsoft Corporation |
.ODS | Oracle Corporation | File con fogli di calcolo | OpenDocument Spreadsheet | Microsoft Excel | Microsoft Corporation |
.ODT | Oracle Corporation | File di testo | OpenDocument Text Document | Microsoft Word | Microsoft Corporation |
.OEACCOUNT | Microsoft Corporation | File di dati | Windows Mail Account File | Microsoft Mail | Microsoft Corporation |
.OEM | Microsoft Corporation | File di settaggi | Original Equipment Manufacturer Setup File | Microsoft Windows | Microsoft Corporation |
.OFC | Microsoft Corporation | File di dati | Open Financial Connectivity File | Microsoft Money | Microsoft Corporation |
.OFFICEUI | Microsoft Corporation | File di settaggi | Microsoft Office UI Customization File | Microsoft Office | Microsoft Corporation |
.OFN | Microsoft Corporation | File di dati | Systems Management Server Offer Creation Notification File | Microsoft Systems Management Server | Microsoft Corporation |
.OFT | Microsoft Corporation | File di dati | Outlook File Template | Microsoft Outlook | Microsoft Corporation |
.OFX | Intuit, Inc. | File di dati | Open Financial Exchange File | Microsoft Money | Microsoft Corporation |
.OGX | Xiph.Org | File video | Ogg Vorbis Multiplexed Media File | Microsoft Windows Media Player | Microsoft Corporation |
.OHP | Microsoft Corporation | File di dati | MS-DOS 7 File | MS-DOS | Microsoft Corporation |
.OLB | Microsoft Corporation | File vari | OLE Object Library | Microsoft Excel | Microsoft Corporation |
.OLE | Microsoft Corporation | File di dati | Microsoft Object Linking And Embedding Data | Microsoft Windows | Microsoft Corporation |
.OLK | Microsoft Corporation | File di dati | Outlook Address Book File | Microsoft Word | Microsoft Corporation |
.OLM | Microsoft Corporation | File di dati | Mac Outlook Database File | Microsoft Outlook 2016 | Microsoft Corporation |
.OLS | Microsoft Corporation | File di dati | Microsoft Office List Shortcut | Microsoft Office | Microsoft Corporation |
.OMP | MatchWare | File con layout di pagina | OpenMind Windows Document | Microsoft Access | Microsoft Corporation |
.ONE | Microsoft Corporation | File di dati | OneNote Document | Microsoft OneNote | Microsoft Corporation |
.ONEBIN | Microsoft Corporation | File temporanei | OneNote Data | Microsoft OneNote | Microsoft Corporation |
.ONECACHE | Microsoft Corporation | File temporanei | Microsoft OneNote Cache File | Microsoft OneNote | Microsoft Corporation |
.ONEPKG | Microsoft Corporation | File backup | Microsoft OneNote Package File | Microsoft OneNote | Microsoft Corporation |
.ONETOC | Microsoft Corporation | File di settaggi | Microsoft OneNote Table Of Contents | Microsoft OneNote | Microsoft Corporation |
.ONETOC2 | Microsoft Corporation | File di settaggi | Microsoft OneNote Table Of Contents File | Microsoft OneNote | Microsoft Corporation |
.OPS | Microsoft Corporation | File di settaggi | Office Profile Settings File | Microsoft Office | Microsoft Corporation |
.OPT | LexisNexis | File di database | Concordance Database File | Microsoft Visual Studio | Microsoft Corporation |
.OPUS | Open Source | File audio | Opus Audio File | Microsoft Windows Media Player | Microsoft Corporation |
.OPX | Insperity Business Services | File di dati | OrgPlus Organizational Chart | Microsoft Office | Microsoft Corporation |
.OQY | Microsoft Corporation | File di database | Excel OLAP Query File | Microsoft Excel | Microsoft Corporation |
.ORDEREDTEST | Microsoft Corporation | File sviluppatore | Visual Studio Ordered Test File | Microsoft Visual Studio | Microsoft Corporation |
.ORF | Olympus Corporation | File Videocamera non elaborati | Olympus RAW File | ACD Systems Canvas | Microsoft Corporation |
.ORP | PV & Associates | File di dati | WinSLAM File | Microsoft Translator | Microsoft Corporation |
.OSC | OpenStreetMap | File di GIS | OpenStreetMap Change File | Microsoft Windows | Microsoft Corporation |
.OSD | Microsoft Corporation | File di dati | Open Software Description Data | Microsoft Application Virtualization | Microsoft Corporation |
.OSDX | Microsoft Corporation | File di settaggi | Search Connector Description File | Microsoft Windows | Microsoft Corporation |
.OSS | Microsoft Corporation | File di settaggi | Microsoft Outlook Saved Search File | Microsoft Outlook | Microsoft Corporation |
.OST | Microsoft Corporation | File vari | Outlook Offline Data File | Microsoft Outlook 2016 | Microsoft Corporation |
.OTM | Microsoft Corporation | File eseguibili | Outlook Macro File | Microsoft Word | Microsoft Corporation |
.OTP | Oracle Corporation | File di dati | OpenDocument Presentation | Microsoft PowerPoint | Microsoft Corporation |
.OUT | Open Source | File eseguibili | Compiled Executable File | Microsoft Notepad | Microsoft Corporation |
.OV3 | Microsoft Corporation | File di sistema | DOS Overlay File | MS-DOS | Microsoft Corporation |
.OXPS | Microsoft Corporation | File con layout di pagina | OpenXPS File | Microsoft XPS Viewer | Microsoft Corporation |