| .PGN | Unknown Developer | File di giochi | Portable Game Notation File | Fritz | Open Source |
| .PGT | Open Source | File di giochi | Pokémon Gift File | Pokesav | PokéCheats |
| .PHE | Open Source | File di giochi | WinChess Game Record | WinChess | Open Source |
| .PHN | Algoryx Simulation | File di giochi | Algodoo Phun Phunlet | Algoryx Algodoo - Phun Edition | Algoryx Simulation |
| .PHX | Runtime Games Ltd | File di giochi | Phoenix RC Simulator Update File | Phoenix RC Simulator | Runtime Games Ltd |
| .PHYSAO | Marathon Open Source | File di giochi | Physics Model | Aleph One | Marathon Open Source |
| .PHZ | Algoryx Simulation | File di giochi | Algodoo Phun Compressed Phunlet | Phun | Open Source |
| .PIG | Interplay Entertainment | File di giochi | Descent Texture File | Interplay Descent 2 | Interplay Entertainment |
| .PIGG | NCSoft | File di giochi | City Of Heroes Data | City of Heroes | NCSoft |
| .PIZ | Winrar | File di giochi | Zipped File | 7-Zip | Igor Pavlov |
| .PJ | Open Source | File di giochi | Project64 Saved State File | Project64 | Open Source |
| .PK3 | id Software | File di giochi | Quake 3 Engine Game Data File | 7-Zip | Igor Pavlov |
| .PK4 | id Software | File di giochi | Doom 3 Engine Game Data File | Corel WinZip 21 | Corel |
| .PKG | Apple | File di giochi | Apple MacOS Installer Package | macOS | Apple |
| .PKM | Various Developers | File di giochi | Pokémon Saved Game Data File | Pokesav | PokéCheats |
| .PKR | Symantec Corporation | File di giochi | Pretty Good Privacy Public Keyring | Pretty Good Privacy (PGP) | Symantec Corporation |
| .PKX | IBM | File di giochi | Rational XDE Data | Rational Rose | IBM |
| .PKZ | Piboso | File di giochi | Kart Racing Pro Track Data | Kart Racing Pro | Piboso |
| .PLAYER | Re-Logic | File di giochi | Terraria Mobile Player File | Re-Logic Terraria | Re-Logic |
| .PLF | Papyrus Services | File di giochi | Papyrus License File | Papyrus II | Papyrus Services |
| .PLN | Microsoft Corporation | File di giochi | Flight Simulator Flight Plan | Microsoft Flight Simulator | Microsoft Corporation |
| .PLR | Re-Logic | File di giochi | Terraria Player File | Terraria | Re-Logic |
| .PLV | Magix Software GmbH | File di giochi | Digital Foto Maker Data | MAGIX Digital Foto Maker | Magix Software GmbH |
| .PMU | David Harris | File di giochi | Pegasus Mail Keyboard Macro | Pegasus Mail | David Harris |
| .PNB | Open Source | File di giochi | Pokemon NetBattle Data | Pokemon NetBattle | Open Source |
| .POD | Terminal Reality | File di giochi | Terminal Reality Game Data File | Dragon UnPACKer | Open Source |
| .POF | Interplay Entertainment | File di giochi | Descent Robot Definition File | Descent 3 | Interplay Entertainment |
| .POG | Interplay Entertainment | File di giochi | Descent 2 Texture Modification | Interplay Descent 2 | Interplay Entertainment |
| .POP | Valve | File di giochi | Team Fortress 2 Population File | Team Fortress 2 | Valve |
| .PPE | GSC Game World | File di giochi | S.T.A.L.K.E.R. Post-process Effector File | S.T.A.L.K.E.R | GSC Game World |
| .PPF | Corel | File di giochi | Picture Publisher Image File | CorelDRAW Graphics Suite | Corel |
| .PPT | Microsoft Corporation | File di giochi | PowerPoint Presentation | Apache OpenOffice | Apache Software Foundation |
| .PQ | Eric Fredricksen | File di giochi | Progress Quest Save File | Progress Quest | Eric Fredricksen |
| .PQHERO | Infinite Interactive | File di giochi | Puzzle Quest Saved Game | Puzzle Quest: Challenge of the Warlords | Infinite Interactive |
| .PR3 | Adobe Systems Incorporated | File di giochi | Adobe Persuasion V3 Presentation | Adobe Persuasion | Adobe Systems Incorporated |
| .PRD | SoftMaker Software | File di giochi | SoftMaker Presentations Document | Softmaker Office | SoftMaker Software |
| .PREFS | VectorStorm | File di giochi | MMORPG Tycoon Preferences File | Eclipse CDT | The Eclipse Foundation |
| .PRG | Open Source | File di giochi | Program File | Notepad++ | Don Ho |
| .PRK | LucasArts Entertainment Company, LLC | File di giochi | Thrillville Park File | Thrillville | Frontier Developments plc |
| .PROFILE | GNU Operating System | File di giochi | Bash Shell Profile | MacroMates TextMate | MacroMates |
| .PROPERTIES | Mojang | File di giochi | Minecraft Properties File | Microsoft Notepad | Microsoft Corporation |
| .PRX | Microsoft Corporation | File di giochi | FoxPro Compiled Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .PS2 | Datel | File di giochi | Sharkport Saved Game File | PS2 Save Builder | Interscape |
| .PSN | OptionVue Systems International | File di giochi | OptionVue Portfolio Manager Positions Data | OptionVue | OptionVue Systems International |
| .PSS | Autodesk, Inc. | File di giochi | AutoCAD Plot Stamp Settings File | Autodesk AutoCAD | Autodesk, Inc. |
| .PSSG | Codemasters | File di giochi | EGO Engine Textures File | DiRT Rally | Codemasters |
| .PSV | Sony | File di giochi | PlayStation 2 Save File | PSV Exporter | Open Source |
| .PSX | Sony | File di giochi | PlayStation Save File | PSXGameEdit | Open Source |
| .PTG | Pearson | File di giochi | PowerTeacher Gradebook Configuration File | PowerTeacher Gradebook | Pearson |
| .PTM | Microsoft Corporation | File di giochi | MapPoint Map File | Microsoft MapPoint | Microsoft Corporation |
| .PTS | Avid Technology | File di giochi | Pro Tools Session | Avid Pro Tools | Avid Technology |
| .PTU | NovaLogic | File di giochi | Nova Logic Effects Definition File | Delta Force | NovaLogic |
| .PUB | Microsoft Corporation | File di giochi | Microsoft Publisher Document | LibreOffice | The Document Foundation |
| .PUD | Blizzard Entertainment Inc. | File di giochi | Blizzard Map | StarCraft | Blizzard Entertainment Inc. |
| .PUZ | Literate Software | File di giochi | Across Lite Crossword Puzzle | Across Lite | Literate Software |
| .PVI | Canon Inc. | File di giochi | Canon Picture Browser Cache Index | Unknown Software | Unknown Developer |
| .PWF | Valve | File di giochi | Counter-Strike PODBot Waypoint File | Half-Life: Counter Strike | Valve |
| .PZL | Tibo Software | File di giochi | Jigs@w Puzzle File | Jigs@w Puzzle | Tibo Software |
| .PZP | Application Techniques Inc. | File di giochi | Pizazz Plus Palette Settings File | Pizazz | Application Techniques Inc. |
| .QC | Valve | File di giochi | Half-Life Model Compiler Script File | Microsoft Notepad | Microsoft Corporation |
| .QDP | NASA | File di giochi | Quick And Dandy Plotter File | Quick and Dandy Plotter (QDP) | NASA |
| .QDU | Surreal Software | File di giochi | The Suffering: Ties That Bind Game Data | The Suffering: Ties That Bind | Surreal Software |
| .QE4 | Xatrix Entertainment | File di giochi | Kingpin Life Of Crime Settings File | Kingpin: Life of Crime | Xatrix Entertainment |
| .QST | Synergy Software | File di giochi | KaleidaGraph Style File | KaleidaGraph | Synergy Software |
| .QSV | Tibo Software | File di giochi | Jigs@w Saved Puzzle State | Jigs@w Puzzle | Tibo Software |
| .QVM | Open Source | File di giochi | Q Virtual Machine | Q (emulator) | Open Source |
| .QWD | id Software | File di giochi | QuakeWorld Demo File | QuakeWorld | id Software |
| .RAS | Remedy Entertainment | File di giochi | Remedy Archive System File | Audacity | Open Source |
| .RAV | Nevrona Designs | File di giochi | Rave Reports Project File | Rave Reports | Nevrona Designs |
| .RAW | Unknown Developer | File di giochi | Raw Image Data File | MacPhun ColorStrokes | Macphun |
| .RB | Larian Studios | File di giochi | Divinity: Original Sin Game Data | Divinity: Original Sin | Larian Studios |
| .RBJ | Marco Pontello | File di giochi | XRK Compiled Redcode Object File | Extra Redcode Kit | Open Source |
| .RBN | Richard Pavlicek | File di giochi | Richard’s Bridge Notation File | Unknown Software | Unknown Developer |
| .RBXL | Roblox Corporation | File di giochi | ROBLOX Location File | ROBLOX | Roblox Corporation |
| .RBXM | Roblox Corporation | File di giochi | ROBLOX Model | ROBLOX | Roblox Corporation |
| .RBZ | Trimble Inc. | File di giochi | SketchUp Plugin | SketchUp | Trimble Inc. |
| .RCC | Angus Johnson | File di giochi | Resource Script File | Microsoft Visual Studio | Microsoft Corporation |
| .RCS | RandomControl | File di giochi | RandomControl Scene File | RandomControl Fryrender | RandomControl |
| .RD2 | Codemasters | File di giochi | TOCA Race Driver 2 Saved Game File | TOCA Race Driver 2 | Codemasters |
| .RDA | Open Source | File di giochi | R Data File | R | The R Foundation |
| .REC | TOPFIELD Co., Ltd. | File di giochi | Topfield PVR Recording | Squared 5 MPEG Streamclip | Open Source |
| .REL | Nintendo | File di giochi | Relocatable Module File | Stage Switcher | Unknown Developer |
| .REP | Rockstar Games | File di giochi | Grand Theft Auto Replay File | Grand Theft Auto III | Rockstar Games |
| .RES | Valve | File di giochi | Valve Resource File | Half-Life | Valve |
| .RESOURCES | Microsoft Corporation | File di giochi | Microsoft Visual Studio Resource | Microsoft Visual Studio | Microsoft Corporation |
| .REZ | Monolith Productions | File di giochi | Lithtech Game Engine Resource File | Dragon UnPACKer | Open Source |
| .RFA | Autodesk, Inc. | File di giochi | Revit Family File | AutoCAD Architecture | Autodesk, Inc. |
| .RFD | Recogniform Technologies | File di giochi | Recogniform Form Designer File | Recogniform | Recogniform Technologies |
| .RFM | Beatnik | File di giochi | Rich Music Format File | Unknown Software | Unknown Developer |
| .RGD | Redbeet Interactive | File di giochi | Raft Saved Game File | Raft | Redbeet Interactive |
| .RGI | RealNetworks | File di giochi | RealArcade Game Installer | RealArcade | RealNetworks |
| .RGM | Relic Entertainment | File di giochi | Essence Game Engine Model File | Warhammer 40K Dawn of War | Relic Entertainment |
| .RGP | RealNetworks | File di giochi | RealArcade Game Package | RealArcade | RealNetworks |
| .RGT | Relic Entertainment | File di giochi | Relic Entertainment Game Texture File | Corsix's Mod Studio | Open Source |
| .RIM | BioWare | File di giochi | BioWare Resource Image File | BioWare Neverwinter Nights | BioWare |
| .RKP | Devolutions | File di giochi | RemoteKeys Profile File | Remote Desktop Manager | Devolutions |
| .RKV | Krome Studios | File di giochi | Star Wars The Clone Wars Republic Heroes Game Archive File | Star Wars: The Clone Wars-- Republic Heroes | Krome Studios |
| .RL | R.LAB | File di giochi | R.viewer List File | R.viewer | R.LAB |
| .RME | Square Enix | File di giochi | Final Fantasy Audio Data | Final Fantasy XI | Square Enix |
| .RMF | Valve | File di giochi | Hammer Rich Map Format | Valve Hammer Editor | Valve |
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