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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .PPL | Open Source | Developer Files | Free Pascal Dynamic Library | Free Pascal | Open Source |
| .PPO | CA Technologies | Uncommon Files | CA Clipper Preprocessor Output | Free Pascal | Open Source |
| .PPU | Open Source | Developer Files | Free Pascal Unit File | Free Pascal | Open Source |
| .PRC | Adobe Systems Incorporated | 3D Image Files | Product Representation Compact File | Cool Reader | Open Source |
| .PRG | Open Source | Executable Files | Program File | AbiWord | Open Source |
| .PROPERTIES | Mojang | Game Files | Minecraft Properties File | gVim | Open Source |
| .PS2 | Datel | Game Files | Sharkport Saved Game File | PCSX2 | Open Source |
| .PSAFE3 | Open Source | Database Files | Password Safe Database | Password Safe | Open Source |
| .PSF | Adobe Systems Incorporated | Settings Files | Photoshop Proof Settings File | XMMS | Open Source |
| .PSPROJ | Broderbund | Page Layout Files | The Print Shop Project File | PyScripter | Open Source |
| .PSS | Autodesk, Inc. | CAD Files | AutoCAD Plot Stamp Settings File | PSS Plex | Open Source |
| .PSV | Sony | Game Files | PlayStation 2 Save File | PSV Exporter | Open Source |
| .PSX | Sony | Game Files | PlayStation Save File | PSXGameEdit | Open Source |
| .PSY | Open Source | Audio Files | Psycle Song File | Psycle | Open Source |
| .PT | Open Source | Text Files | Zope Page Template | Zope | Open Source |
| .PTL | IBM | Developer Files | Rational Rose Petal File | CodeEditor | Open Source |
| .PTM | Microsoft Corporation | GIS Files | MapPoint Map File | ModPlug Player | Open Source |
| .PTN | Nuance | Data Files | PaperPort Thumbnail File | Amaya | Open Source |
| .PTO | Unknown Developer | Data Files | Hugin Project File | Hugin | Open Source |
| .PTX | Adobe Systems Incorporated | Font Files | PageMaker Template File | UFRaw | Open Source |
| .PUB | Microsoft Corporation | Page Layout Files | Microsoft Publisher Document | ssh-keygen | Open Source |
| .PVD | Varden Development | Data Files | Polygen3D Vector Descriptor | ParaView | Open Source |
| .PVK | Microsoft Corporation | Encrypted Files | Private Key File | OpenSSL | Open Source |
| .PVX | Kitware, Inc. | Settings Files | ParaView XML Configuration File | ParaView | Open Source |
| .PWN | CompuPhase | Developer Files | Pawn Source Code File | SA-MP Editor | Open Source |
| .PXD | Greg Ewing | Developer Files | Pyrex Definition File | Cython | Open Source |
| .PXE | Open Source | System Files | Linux, Unix Network Bootable Image | Linux | Open Source |
| .PXI | Plextor | Disk Image Files | PlexTools Disk Image File | Cython | Open Source |
| .PXM | The Pixelmator Team | Raster Image Files | Pixelmator Image File | PCSX Rerecording | Open Source |
| .PXN | Open Source | Uncommon Files | PictureWorks PhotoEnhancer Image | Darktable | Open Source |
| .PXO | Open Source | Backup Files | PicoBackup Backup Script | PicoBackup | Open Source |
| .PY | Python Software Foundation | Developer Files | Python Script | gVim | Open Source |
| .PY2 | Python Software Foundation | Developer Files | Python Script | gVim | Open Source |
| .PYS | Microsoft Corporation | Data Files | Microsoft Console Based Script Host File | Pyspread | Open Source |
| .Q | Open Source | Data Files | Tinn-R Editor Data | Tinn-R Editor | Open Source |
| .Q43 | Unknown Developer | Data Files | Aqbanking Q43 File Format | AqBanking | Open Source |
| .QCI | Quadratron Systems | Uncommon Files | Cliq Accessories Phonebook Index | Massively Parallel Quantum Chemistry Program | Open Source |
| .QCOW2 | Open Source | Disk Image Files | QEMU Copy On Write Version 2 Disk Image | Quick Emulator (QEMU) | Open Source |
| .QDP | NASA | Data Files | Quick And Dandy Plotter File | MPQDraft | Open Source |
| .QFX | Intuit, Inc. | Data Files | Quicken Financial Exchange File | GnuCash | Open Source |
| .QIF | Intuit, Inc. | Data Files | Quicken Interchange Format File | GnuCash | Open Source |
| .QPK | Unknown Developer | Data Files | Qt Extended Installable Package | Qt Extended | Open Source |
| .QPS | Open Source | Data Files | CUTEr QPS Model | CUTEr | Open Source |
| .QT | Apple | Video Files | Apple QuickTime Movie | Eltima Elmedia Player | Open Source |
| .QTK | Apple | Vector Image Files | Apple QuickTake Picture | Darktable | Open Source |
| .QTM | Apple | Video Files | Apple QuickTime Movie | Eltima Elmedia Player | Open Source |
| .QUAD | Open Source | Compressed Files | QUAD Compressed Archive File | QUAD | Open Source |
| .QVM | Open Source | System Files | Q Virtual Machine | Q (emulator) | Open Source |
| .R | Open Source | Developer Files | R Script File | ModPlug Player | Open Source |
| .R00 | Rocky Sand Studio | Compressed Files | WinRAR Compressed Archive | PeaZip | Open Source |
| .R06 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | PeaZip | Open Source |
| .R07 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | PeaZip | Open Source |
| .R09 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | PeaZip | Open Source |
| .R36 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | PeaZip | Open Source |
| .R50 | Eugene Roshal | Compressed Files | Split Multi-volume RAR Compressed File | PeaZip | Open Source |
| .RAD | Reality Pump Studios | Audio Files | Reality Adlib Tracker Module | RADIANCE | Open Source |
| .RAP | Open Source | Page Layout Files | Raptor Flowchart File | RAPTOR | Open Source |
| .RAR | Rocky Sand Studio | Compressed Files | WinRAR Compressed Archive | PeaZip | Open Source |
| .RAS | Remedy Entertainment | Game Files | Remedy Archive System File | Audacity | Open Source |
| .RAW | Unknown Developer | Camera Raw Files | Raw Image Data File | UFRaw | Open Source |
| .RB | Larian Studios | Game Files | Divinity: Original Sin Game Data | Calibre | Open Source |
| .RBC | IBM | Developer Files | Rembo-C Script | Rembo Toolkit | Open Source |
| .RBJ | Marco Pontello | Game Files | XRK Compiled Redcode Object File | Extra Redcode Kit | Open Source |
| .RBS | Microsoft Corporation | Backup Files | Windows Installer Rollback Script File | Media Player Classic | Open Source |
| .RBX | IBM | Executable Files | Rembo-C Compiled Script | Rembo Toolkit | Open Source |
| .RCJ | Microsoft Corporation | Text Files | Robocopy Job File | Notepad2 | Open Source |
| .RCO | Sony | System Files | PlayStation Portable File | RCO Editor | Open Source |
| .RDB | EMC | Backup Files | Retrospect Backup Set | Project64 | Open Source |
| .RDC | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .RDF | Unknown Developer | Settings Files | Resource Description Framework File | Notepad2 | Open Source |
| .README | The Document Foundation | Text Files | Readme Text Document File | Pico | Open Source |
| .REB | REBOL Technologies | Developer Files | REBOL Script File | Reimbursement Tracker | Open Source |
| .REC | TOPFIELD Co., Ltd. | Video Files | Topfield PVR Recording | Squared 5 MPEG Streamclip | Open Source |
| .REF | Clark Labs | GIS Files | IDRISI Raster Image Reference File | GDAL | Open Source |
| .REP | Rockstar Games | Game Files | Grand Theft Auto Replay File | GTA Replays Manager | Open Source |
| .REPORT | Sublime HQ Pty Ltd | Data Files | Report File | PSPad | Open Source |
| .REQ | Open Source | Uncommon Files | SSL Certificate Request File | OpenSSL | Open Source |
| .REX | Propellerhead | Audio Files | ReCycle Loop File | BRexx | Open Source |
| .REXX | SourceForge | Developer Files | Rexx Source | BRexx | Open Source |
| .REZ | Monolith Productions | Game Files | Lithtech Game Engine Resource File | Dragon UnPACKer | Open Source |
| .RFA | Autodesk, Inc. | Data Files | Revit Family File | Dragon UnPACKer | Open Source |
| .RG | Open Source | Raster Image Files | Bitmap Picture File | IrfanView | Open Source |
| .RGM | Relic Entertainment | Game Files | Essence Game Engine Model File | Corsix's Mod Studio | Open Source |
| .RGT | Relic Entertainment | Game Files | Relic Entertainment Game Texture File | Corsix's Mod Studio | Open Source |
| .RHTML | Yukihiro “Matz” Matsumoto | Web Files | Ruby HTML Web Page | Amaya | Open Source |
| .RIK | Open Source | GIS Files | SharpMap File | SharpMap | Open Source |
| .RIV | Open Source | Data Files | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .RL4 | Various Developers | Raster Image Files | Bitmap Image File | IrfanView | Open Source |
| .RL8 | Microsoft Corporation | Graphic Files | Windows Bitmap Image | IrfanView | Open Source |
| .RLE | Various Developers | Raster Image Files | Run Length Encoded Bitmap | BRL-CAD | Open Source |
| .RM | RealNetworks | Video Files | RealMedia File | Eltima Elmedia Player | Open Source |
| .RMI | Open Source | Audio Files | RMID MIDI File | vanBasco's Karaoke Player | Open Source |
| .RMM | RealNetworks | Audio Files | RAM Meta File | Media Player Classic | Open Source |
| .RMP | RealNetworks | Video Files | RealPlayer Metadata Package File | Mobile Atlas Creator | Open Source |
| .RMT | The Catalina Group | System Files | Router Firmware File | Amaya | Open Source |
| .ROM | Various Developers | Uncommon Files | Read Only Memory Image | Basilisk II | Open Source |
| .ROQ | id Software | Video Files | Id Software Game Video | Media Player Classic | Open Source |
| .RP9 | Cloanto Corporation | Compressed Files | RetroPlatform Disk Image Archive | E-UAE | Open Source |
| .RPG | Open Source | Uncommon Files | Programming Language Source Code File | RPG Toolkit | Open Source |
| .RPM | Red Hat | Compressed Files | Red Hat Package Manager File | Red Hat Package Manager | Open Source |
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