| .OR3 | IBM | Gegevensbestanden | IBM Lotus Organizer 97 File | IBM Lotus Organizer | IBM |
| .OR4 | IBM | Gegevensbestanden | IBM Lotus Organizer 97 GS File | IBM Lotus Forms Viewer | IBM |
| .OR5 | IBM | Gegevensbestanden | Lotus Organizer 5 File | IBM Lotus Organizer | IBM |
| .OR6 | IBM | Gegevensbestanden | Lotus Organizer Data | IBM Lotus Organizer | IBM |
| .ORC | Voyetra Turtle Beach | Gegevensbestanden | Voyetra Digital Orchestrator File | Digital Orchestrator | Voyetra Turtle Beach |
| .ORD | OMAX Corporation | Gegevensbestanden | OMAX Routed Data | Unknown Software | Unknown Developer |
| .ORG | IBM | Gegevensbestanden | Lotus Organizer File | IBM Lotus Organizer | IBM |
| .ORIGINAL | NetObjects | Gegevensbestanden | Netobjects Fusion Components Bbscomp Message Data | NetObjects Fusion | NetObjects |
| .ORM | Ormetis S.A.S. | Gegevensbestanden | Ormetis Workbench Data | Ormetis | Ormetis S.A.S. |
| .ORP | PV & Associates | Gegevensbestanden | WinSLAM File | WinSLAMM | PV & Associates |
| .OS | Open Source | Gegevensbestanden | ObjectScript Source File | ObjectDevel | Open Source |
| .OSA | Symantec Corporation | Gegevensbestanden | W32/Sober-AD File | AVG Antivirus | AVG Technologies |
| .OSD | Microsoft Corporation | Gegevensbestanden | Open Software Description Data | Microsoft Application Virtualization | Microsoft Corporation |
| .OSI | Jamie Wilkinson | Gegevensbestanden | Osiris Database | Osiris | Jamie Wilkinson |
| .OSL | Ockam Instruments | Gegevensbestanden | OckamSoft Log File | OckamSoft | Ockam Instruments |
| .OSMALLER | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .OSZ | Ppy Pty Ltd | Gegevensbestanden | Osu! Beatmap File | osu! | Ppy Pty Ltd |
| .OT | Open Source | Gegevensbestanden | TheWord Old Testament Text Module | theWord | Costas stergiou |
| .OTL | Fookes Software | Gegevensbestanden | NoteTab Outline File | NoteTab | Fookes Software |
| .OTN | Nuance | Gegevensbestanden | OmniPage Training File | OmniPage | Nuance |
| .OTP | Oracle Corporation | Gegevensbestanden | OpenDocument Presentation | Apache OpenOffice | Apache Software Foundation |
| .OTX | Open Source | Gegevensbestanden | TheWord Encrypted Old Testament Text Module | theWord | Costas stergiou |
| .OUT | Open Source | Gegevensbestanden | Compiled Executable File | Linux | Open Source |
| .OUV | Le Sphinx | Gegevensbestanden | Sphinx Open Ended Responses Data | Sphinx | Le Sphinx |
| .OV | Revelation Software | Gegevensbestanden | OpenInsight Database Overflow Data | OpenInsight | Revelation Software |
| .OVA | VMware | Gegevensbestanden | Open Virtual Appliance | VMware Workstation | VMware |
| .OVD | Elias Fotinis | Gegevensbestanden | OverDisk Database | OverDisk | Elias Fotinis |
| .OVF | VMware | Gegevensbestanden | Open Virtualization File | VMware Workstation | VMware |
| .OVLX | Rick Meyers | Gegevensbestanden | E-Sword Overlay Data | e-Sword | Rick Meyers |
| .OVX | Psion PLC | Gegevensbestanden | Object-based Visual Application Language File | Psion OVAL | Psion PLC |
| .OWC | OutWit Technologies | Gegevensbestanden | OutWit Catch Database | Mozilla Firefox | Mozilla |
| .OWF | OSRAM GmbH | Gegevensbestanden | OSRAM Waveform File | Unknown Software | Unknown Developer |
| .OZD | Symantec Corporation | Gegevensbestanden | Win32.TrojanDownloader.Agent.OZD Trojan | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
| .P | Python Software Foundation | Gegevensbestanden | Python Pickle File | Python pickle | Python Software Foundation |
| .P0 | Würth Online World GmbH | Gegevensbestanden | WOW! Data | WOW! | Würth Online World GmbH |
| .P06 | Bentley Systems | Gegevensbestanden | MicroStation Modification Project Resource File | MicroStation | Bentley Systems |
| .P07 | Peter B. Clements | Gegevensbestanden | PAR Recovery Volume | QuickPar | Open Source |
| .P1D | The Danfoss Group | Gegevensbestanden | PLUS+1 Data | Plus+1 | The Danfoss Group |
| .P2B | Open Source | Gegevensbestanden | PeerGuardian 2 IP Blocking List | PeerGuardian 2 | Open Source |
| .P2C | IBM | Gegevensbestanden | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .P3 | Oracle Corporation | Gegevensbestanden | Primavera P3 Project File | Primavera | Oracle Corporation |
| .P38 | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .P3E | Adobe Systems Incorporated | Gegevensbestanden | Photoshop Repousse Settings File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .P3I | Tech4Learning | Gegevensbestanden | Pixie File | Pixia | Isao Maruoka |
| .P3L | Adobe Systems Incorporated | Gegevensbestanden | Adobe Photoshop Light Preset File | Adobe Photoshop | Adobe Systems Incorporated |
| .P5P | Oracle Corporation | Gegevensbestanden | Oracle Solaris Image Packaging System | Solaris | Oracle Corporation |
| .P7X | Microsoft Corporation | Gegevensbestanden | Packed Digital Signature File | Microsoft Visual Studio | Microsoft Corporation |
| .P83 | GAEB | Gegevensbestanden | GAEB DA 2000 Data | GAEB data exchange XML | GAEB |
| .PA2 | Dr. Hsin H. Huang | Gegevensbestanden | STABCAL Data File | STABCAL | Dr. Hsin H. Huang |
| .PAB | Microsoft Corporation | Gegevensbestanden | Personal Address Book | Microsoft Outlook Express | Microsoft Corporation |
| .PACK | neOceane | Gegevensbestanden | CustoPack Tools Theme Pack | CustoPack Tools | neOceane |
| .PAD | Swiftpage, Inc. | Gegevensbestanden | ACT! Database Pointer File | Act! | Swiftpage, Inc. |
| .PAF | FamilySearch | Gegevensbestanden | Personal Ancestral File | Personal Ancestral File | FamilySearch |
| .PAG | Microsoft Corporation | Gegevensbestanden | Visual Basic Property PAGe File | Microsoft Visual Basic | Microsoft Corporation |
| .PAI | Magix Software GmbH | Gegevensbestanden | MAGIX Photo Clinic File | Photo Clinic | Magix Software GmbH |
| .PAM | Open Source | Gegevensbestanden | Portable Arbitrary Map | Adobe Photoshop | Adobe Systems Incorporated |
| .PAR | Siemens PLM Software | Gegevensbestanden | Solid Edge Part File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .PARAM | Open Source | Gegevensbestanden | CASTEP Parameters Data | CASTEP | Open Source |
| .PARSER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PART1 | NetObjects | Gegevensbestanden | NetObjects Fusion System Data | NetObjects Fusion | NetObjects |
| .PART2 | NetObjects | Gegevensbestanden | NetObjects Fusion System Data | NetObjects Fusion | NetObjects |
| .PASCAL | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PASS | Apple | Gegevensbestanden | Xcode Wallet Data | Apple Xcode | Apple |
| .PAT | Autodesk, Inc. | Gegevensbestanden | AutoCAD Hatch Pattern File | Autodesk AutoCAD | Autodesk, Inc. |
| .PATCHER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PATH | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PAUSE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PAV | Peavey Commercial Audio | Gegevensbestanden | MediaMatrix Peavey Architectural View Data | MediaMatrix | Peavey Commercial Audio |
| .PAW | SecurelyShare | Gegevensbestanden | PawaaFILE File Format | SecurelyShare | SecurelyShare |
| .PAY | Priority Data Sytems | Gegevensbestanden | PriorityRate File | PriorityRate | Priority Data Sytems |
| .PAYROLL | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PB | Fantaisie Software | Gegevensbestanden | PureBasic Source File | PureBasic | Fantaisie Software |
| .PB1 | Broderbund | Gegevensbestanden | Broderbund 3D Home Architect Data | 3D Home Architect | Broderbund |
| .PBD | EaseUS | Gegevensbestanden | EaseUS Todo Backup Backup File | EaseUS Todo Backup | EaseUS |
| .PBE | Crownhill Associates Limited | Gegevensbestanden | Proton Plus Compiler Data | Proton Plus Compiler | Crownhill Associates Limited |
| .PBK | Microsoft Corporation | Gegevensbestanden | Dial-Up Phone Book File | Microsoft Windows | Microsoft Corporation |
| .PBR | Sybase, Inc | Gegevensbestanden | PowerBuilder Resource File | PowerBuilder | SAP |
| .PBU | PowerBASIC, Inc. | Gegevensbestanden | PowerBASIC DOS Compiled Unit | PowerBASIC | PowerBASIC, Inc. |
| .PC | Personal Composer | Gegevensbestanden | Personal Composer File | Personal Composer | Personal Composer |
| .PC5 | Rockwell Automation Inc. | Gegevensbestanden | RSLogix 5 Internal Data | RSLogix 5 | Rockwell Automation Inc. |
| .PCAP | The Wireshark Team | Gegevensbestanden | Packet Capture Data | Wireshark | The Wireshark Team |
| .PCB | Autodesk, Inc. | Gegevensbestanden | Printed Circuit Board Design File | CadSoft EAGLE | Autodesk, Inc. |
| .PCBDOC | Altium | Gegevensbestanden | Printed Circuit Board Description | Altium Designer | Altium |
| .PCC | Electronic Arts | Gegevensbestanden | Mass Effect Package | Mass Effect 3 | BioWare |
| .PCD | PokéCheats | Gegevensbestanden | Pokémon Wonder Card File | Pokesav | PokéCheats |
| .PCE | Open Source | Gegevensbestanden | TurboGrafx-16 ROM | Magic Engine | Open Source |
| .PCH | MSC Software | Gegevensbestanden | Nastran Punch Output File | MSC Nastran | MSC Software |
| .PCK | Microsoft Corporation | Gegevensbestanden | System Center Configuration Manager Package File | Microsoft system center configuration manager | Microsoft Corporation |
| .PCP | Microsoft Corporation | Gegevensbestanden | Windows Installer Patch Creation Properties File | Microsoft Windows SDK | Microsoft Corporation |
| .PCR | Futuremark Corporation | Gegevensbestanden | PCMark Vantage Benchmark File | PCMark | Futuremark Corporation |
| .PCT | Apple | Gegevensbestanden | Macintosh PICT Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .PD | SAI | Gegevensbestanden | FlexiSIGN 5 Plotter Document | FlexiSIGN | SAI |
| .PD3 | Autodesk, Inc. | Gegevensbestanden | 3D Studio Max Data | Autodesk 3ds Max | Autodesk, Inc. |
| .PD4 | Jan van Wijk | Gegevensbestanden | DFSee Partition Table And Boot Sector Backup | DFSee | Jan van Wijk |
| .PD5 | Microsoft Corporation | Gegevensbestanden | Windows Live Photo Gallery Information File | Windows Photo Gallery | Microsoft Corporation |
| .PDA | Molecular Devices | Gegevensbestanden | SoftMax Pro Microplate Data Analysis File | SoftMax Pro | Molecular Devices |
| .PDAS | hfrmobile | Gegevensbestanden | PDAStore Data Store File | PDAStore | hfrmobile |
| .PDATA | Physiome Project | Gegevensbestanden | JSim Pretty Data Format | JSim | Physiome Project |
| .PDB | Various Developers | Gegevensbestanden | Program Database | Microsoft Visual Studio | Microsoft Corporation |
| .PDD | Adobe Systems Incorporated | Gegevensbestanden | Adobe PhotoDeluxe Image | Adobe Illustrator CC | Adobe Systems Incorporated |
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