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