.P Prolog programming language file.
.P01 Gear image file (Power Software's Free Any Burn).
.PAK Fox Pack file = compressed container file (FoxPro).
.PAK Package file = archive (Many games and formats).
.PAL Color palette (LinCity-NG).
.PAL Color Palette file (Many graphics applications and format variations).
.PAL Palette file (C Jain's Mountain 3D).
.PAL Palette file (Equilibrium's DeBabelizer 5).
.PAL Palette file (Hagen Wieshofer's Icon Edit Pro).
.PAL Palette file (Jasc Paint Shop Pro).
.PAL Palette file (Pixel Studio Pro).
.PAL PhraseExpress words file (Bartels Media PhraseExpress).
.PAL RIFF Palette file (Ulead Video Paint).
.PAP Paper file (Boris Eyrich Software Artweaver).
.PAQ PAQ archive file = a type of brute force compressed archive (Many variants, many archive applications).
.PAQ8O PAQ8O archive file = One of many PAQ-based brute force compression algorithms (PeaZip).
.PART Partial file = usually an incomplete file or a placeholder file that is eventually used to store the downloaded file content once it commences(eMule-Project.net's eMule, GoZilla, Mozilla Firefox, and many other file transferring/writing/sharing applications).
.PAS Pascal/Delphi programming language source code file.
.PAT Hatch Pattern image file (CorelCAD).
.PAT Patch file = A file whose content is used to repair, update, or otherwise modify another file or files.
.PAT Pattern image file (CorelDRAW).
.PAT Pattern image file (Jasc Paint Shop Pro 9).
.PB PureBasic code (PureBasic applications).
.PBA Pixel Animated Brush file (Pixel Studio Pro).
.PBD PhotoDeluxe Business Edition Document file (Adobe's PhotoDeluxe Business Edition).
.PBI PureBasic Includes file (PureBasic applications).
.PBK Phonebook file (Windows Remote Access Services/RAS).
.PBL Premiere Batch capture List file (Adobe Premiere 5).
.PBM Portable Bitmap image file (Many applications).
.PBU Personal Backup file (Personal Backup).
.PBV Paint Brush file (Boris Eyrich Software Artweaver).
.PC Postcard document file (Sierra On-Line's Print Artist 3).
.PCA Perfect Clarity Audio file (Sonic Foundry Sound Forge).
.PCD Kodak CMS Photo CD images (Multiple sizes).
.PCK PL/SQL stored procedures Package file (Oracle's PL/SQL).
.PCL Compiled Parcel format file (Cincom VisualWorks SmallTalk).
.PCM Raw PCM audio file (Many audio applications).
.PCPATCH NetImmersive/Gamebryo model File (NifTools NifSkope).
.PCR Postcard project file (MindScape PrintMaster Publishing Suite).
.PCS Painter Color Set file = Palette (MetaCreations Painter).
.PCX Personal Computer Exchange format graphic image file (ZSoft Paintbrush).
.PCX Fax file (ElectraSoft 32bit Fax 9).
.PDB Microsoft C/C++ Database file (Many applications).
.PDD PhotoDeluxe Document file (Adobe PhotoDeluxe and Photoshop).
.PDF Portable Document Format file developed by and for Adobe Acrobat (Many applications).
.PDI InstantCopy Image file (Power Software's Free Any Burn).
.PDN Paint.Net image file (Circular & Fabien Wang's LazPaint 4).
.PDN Portable Draughts Notation file containing one or multiple games (Harm Jetten's DAM and other Draughts games).
.PDO Paradox table file (Paradox 3 and 4).
.PDQ Flowchart file (Patton&Patton Flow Charting PDQ).
.PE3 PhotoImpact Explorer 3 thumbnail image cache file (PhotoImpact Explorer).
.PEF Pentax Electronic Format RAW image file. (Pentax and Samsung digital cameras, many variants).
.PEXSQL PhraseExpress SQL database file (Bartels Media PhraseExpress).
.PF Device colorspace Profile (Many applications).
.PFB Prefab file (Leadwerks 3D World Studio).
.PFB Printer Font Binary file = Adobe Type 1 font file (Many applications).
.PFC PerfectFit Component file (Corel WordPerfect Office Suite).
.PFF Premiere Filter Factory settings file (Adobe Premiere 5).
.PFM Printer Font Metrics file (Many applications).
.PFR Paint Shop Frame file (Jasc Paint Shop Pro).
.PFS PFS stream file (LuminanceHDR and other HD imaging applications).
.PFX Personal Information Exchange file (Microsoft Windows operating systems).
.PFX Premiere Effects/Transition file (Adobe Premiere 5).
.PFX Preset OpenFX model file (OpenFX).
.PG4 Page template file = ZIP archive containing XML, PNG, and WAV files (Indigo Rose's AutoPlay Media Studio 4).
.PGE EzyPage project file (EzyWare's EzyPage).
.PGM Portable Grayscale Map image file (Many graphics applications).
.PGP Pretty Good Privacy encrypted file (Pretty Good Privacy).
.PHD Photodex file mirror file = index (Photodex' CompuPic Express).
.PHP PHP: Hypertext Preprocessor markup file (Many server applications and editors).
.PHP3 PHP 3 file (Crimson Editor, Norio Nakatani's Sakura Editor).
.PHP3 PHP 3 markup file (Many server applications and editors).
.PHP4 PHP 4 file (Crimson Editor).
.PHP4 PHP 4 markup file (Many server applications and editors).
.PHT Photo album file (SSuite Office EZPhoto Album).
.PIC Autodesk image file.
.PIC Lotus PIC picture format image file (Many Office suites and graphics applications).
.PIC Pegasus PIC image file = Pegasus JPEG (Many graphics applications).
.PIC Radiance RGBE picture file (LuminanceHDR).
.PICT Picture format of the Macintosh OS. Many image processing applications import them.
.PIMX XML format Package Installation Manager file (Adobe Systems' Audition).
.PIP Settings file (Microsoft Office XP Professional).
.PIX Alias PIX format image file (Many applications).
.PJT Project file (Microsoft Visual FoxPro 6).
.PJX Project file (Microsoft Visual FoxPro 6).
.PK3 PAK 3 Package file = archive (Electronic Arts' Medal of Honor Pacific Assault, Unvanquished, Quake III, and many other games/game developers).
.PKF Temporary file (Diamond Cut Millenium).
.PKZ Phil Katz ZIP archive file = PK is the "code-borrowing/theft" developer of the ZIP format archive (PKWare's PKZIP and other applications).
.PL Markup that references Perl scripts (Few applications).
.PL Perl language script file (Many applications).
.PLA Player file (Business Game Builder).
.PLB FoxPro 2.0 Library file (FoxPro 2.0).
.PLB Premiere Library file (Adobe Premiere 5).
.PLG Plug-in file (Boris Eyrich Software Artweaver).
.PLIST Preferences List file (Apple QuickTime Player).
.PLIST Property List file (Many applications and development environments).
.PLR NOX Player save file (Westwood Studio's NOX).
.PLS Playlist file (Many audio players).
.PLT HPGL Plotter file = Hewlett Packard/HP Graphics Language format.
.PLT Palm Pilot image = Hewlett-Packard Graphics Language format image.
.PLT Plot graph file (GnuPlot).
.PLT Template/Boilerplate = precomposed document requiring marginal edits and/or automated text insertions/replacements of text or data/text fields in order to form a completed, exportable document (Mass mailing applications).
.PLUGINSPEC Plug-in specification file (Digia Qt Creator).
.PLY Playlist file (Willow Anvil Studio 2012 and many other audio applications).
.PM Pegasus Mail configuration file (David Harris' Pegasus Mail).
.PM Perl Module/source code file (Many applications).
.PMD Pegasus Mail Dictionary file (David Harris' Pegasus Mail).
.PMD PlanMaker spreadsheet Document file (SoftMaker Office PlanMaker).
.PMO PrintMaster Object file (MindScape PrintMaster Publishing Suite).
.PMR PhotoModeller project file (PhotoModeller/PhotoModeller Lite).
.PMT Premiere Motion settings or Mesh Warp filter settings file (Adobe Premiere 5).
.PMV PlanMaker spreadsheet Template file (SoftMaker Office PlanMaker).
.PNID Postit Note description file = Text content (PNotes).
.PNOTE Postit Note file (PNotes).
.PNPTC PnP Terrain Creator project file (Team PnP's PnP Terrain Creator).
.PNQ Plug-in file (Miribilis' ICQ2000a).
.PNT MacPaint image format file (MacPaint and many image applications).
.PNTG MacPaint image format file (MacPaint and many image applications).
.POD Perl language POD file = Plain Old Documentation markup language (Perl programming language applications).
.POLICY Java Policy file (Many applications).
.POT PowerPoint Presentation design Template file (Microsoft PowerPoint and many other Office suites).
.POTHTML PowerPoint HTML Presentation design Template file (Microsoft PowerPoint).
.POTM PowerPoint Macro-enabled document Template file (Microsoft Office PowerPoint).
.POTX PowerPoint Presentation design XML format Template file (Microsoft Office PowerPoint).
.POV POV-Ray/Persistence Of Vision Raytracer format image file (POV is a free ray-tracing package).
.PP Pre-parsed data file.
.PP4 Picture Publisher version 4 image file (Micrografx Picture Publisher version 4).
.PP5 Picture Publisher version 5 image file (Micrografx Picture Publisher version 5).
.PPA PowerPoint Add-in file (Microsoft PowerPoint).
.PPD Postscript Printer Description files = machine-readable text used by printing facilities to render postscript documents.
.PPF Picture Publisher Format image file (Micrografx Picture Publisher).
.PPI Passport initialization file (Microsoft Passport Configuration Utility).
.PPJ Premiere Project file (Adobe Premiere 5).
.PPK PuTTY Private Key file = RSA/DSA digital signature (Simon Tatham's PuTTY Authenticaion Agent and PuTTYgen).
.PPM Portable Pixel Map image file (Many graphics applications).
.PPP Power Producer Project file (CyberLink Power Producer).
.PPR PaintStar Project file (PaintStar).
.PPS PowerPoint Show file (Many Office suites).
.PPS PowerPoint Slide show file (Microsoft PowerPoint).
.PPSM PowerPoint Macro-enabled Slideshow file (Microsoft Office's PowerPoint).
.PPSX PowerPoint Presentation Slideshow file (Microsoft Office's PowerPoint).
.PPSX PowerPoint Show file (Many Office suites).
.PPT PowerPoint Presentation file (Many Office suites, many variants).
.PPTH PowerPoint HTML document file (Office applications).
.PPTHTML PowerPoint HTML document file (Microsoft PowerPoint).
.PPTM PowerPoint Presentation Macro-enabled file (Microsoft Office).
.PPTX PowerPoint Presentation open-XML format (Microsoft Office).
.PQG PowerQuest Graphic file = Bitmap image (PowerQuest Partition Magic).
.PQW Presentations QuickFile runtime file (Corel Word Perfect Office X6).
.PRAPIC Praat Picture file (Paul Boersma's and David Weenink's Praat).
.PRC Palm Resource file (Palm operating system).
.PRD Presentations Document file (SoftMaker Office Presentations).
.PRD Presentations Template file (SoftMaker Office Presentations).
.PRE ArtSet Pre file (Pixarra TwistedBrush Pro).
.PREF Preference subset file (Björn Gustavsson's Wings 3D).
.PRF PICS Rules File (Microsoft Windows - Content Advisor).
.PRF Preferences file (eMagic SoundDiver).
.PRF Premiere Preferences file (Adobe Premiere 5).
.PRF Profile settings file (Microsoft Outlook).
.PRF Project Features file (Digia Qt Creator).
.PRG Harbour programming language Program file (Harbour applications).
.PRG Program file (Willow Anvil Studio 2012).
.PRI Qt Project Includes file (Digia Qt Creator).
.PRJ Project file (Axogon Composer).
.PRJ Project file (Daniel Taverney's Win2Web 2).
.PRJ Project file (Many applications and variations).
.PRJ Project file (XlineSoft's Database to HTML Express 2.2).
.PRM Premiere plug-in file (Adobe Premiere 5).
.PRN Fixed-width document/printer file (Various programs).
.PRN Printer output file (Various programs).
.PRO Process file (Business Game Builder).
.PRO Profile file (Many applications).
.PRO Project file (Lorenz Graf's HTMLtool).
.PRO Project file (Many applications).
.PROGRAM Program file = program source code or script.
.PROLOG Prolog program or source code file.
.PRP Pocket Radio Player radio station file = ZIP compressed archive (Stefan Sarbok's Pocket Radio Player).
.PRP User prep file (Macromedia Freehand 7).
.PRS Harvard Graphics format image (Harvard Graphics).
.PRS Project Settings file (Adobe Premiere 5).
.PRS Presentations Show file (SoftMaker Office Presentations).
.PRS Preset file (Sonic Syndicate Orion).
.PRT Part or Part assembly file (CAD/CAM applications).
.PRT Presentations Template file (Corel Office).
.PRT Print or Printer output file = a file whose content is suitable for direct output to printer devices or printer output management facilities (Many applications).
.PRV Priviledge file (Preview Systems' Vbox Builder 4).
.PRX Windows media Profile file (AIST MoviePack/MovieDV/MovieXone).
.PS Adobe PostScript format file = a file that describes a printed image which requires an interpreter, such a Ghostscript, or an interpreting device, such as a PostScript capable printer, in order to print the described image (Many applications and devices, many format variations).
.PS Paint Shop resource file (Jasc Paint Shop Pro).
.PS00 .PS09999 Puran Split file (Puran Splitter).
.PS3 Encapsulated PostScript vector based drawing (Many variants, many programs).
.PSAFE3 Password Safe database file (Password Safe v3).
.PSB Psycle tracker Pattern file (Psycle).
.PSD Photoshop Document format. This is the native project/image save format of Adobe's Photoshop. It enjoys significant support in third party applications, including some competitor products, though most do not recognize or handle all PSD file content.
.PSF Photo Studio File (Arcsoft's Photo Studio 2000).
.PSP Adobe Photoshop Preferences file (Adobe Photoshop).
.PSP Paint Shop Pro format image file. The native image format of Paint Shop, it is supported by some third party image editors and graphics applications (Jasc Paint Shop Pro, now owned and developed by Corel Corporation).
.PSQ Premiere Sequence file (Adobe Premiere 5).
.PSS PostScript printer Stub file (Many printing/font applications).
.PST Personal folders (Microsoft OutLook/OutLook Express).
.PST Plug-In Settings file (MAGIX Music Studio 6).
.PST SmallTalk source code Parcel file (Cincom VisualWorks SmallTalk).
.PSV Psycle tracker display presets file (Psycle).
.PSW Pixel Swatch file (Pixel Studio Pro).
.PSW Pocket Word format document file (Pocket Word, SoftMaker Office TextMaker and other word processor applications).
.PSY Psycle tracker song/sample/instrument file (Psycle).
.PTB Panorama Tools batch panorama/stitcher script (Panorama Tools, Hugin, etc.).
.PTC Patch file = audio loop/sample (Audio applications).
.PTL Premiere Title file (Adobe Premiere 5).
.PTM Pixel Template file (Pixel Studio Pro).
.PTO Panorama Tools/PanoTools panorama/stitch project file (Hugin).
.PTP PanoTools file (Hugin PanoTools).
.PTS Panorama Tools/PanoTools script file (PanoTools, Hugin, etc.).
.PTS Presets file (Nothing Else Matters' vTuner).
.PTX Pattern file (Pixel Studio Pro).
.PTX Presets file (Jasc Paint Shop Pro).
.PVK Private/Privacy Key file (Microsoft Windows operating systems).
.PWZ PowerPoint Wizard file (Microsoft PowerPoint).
.PX Pixel image file (Pixel Studio Pro).
.PX3 PhraseExpress Phrases file (Bartels Media PhraseExpress).
.PXI PlexTools Image file (Power Software's Free Any Burn).
.PXP PhraseExpress Phrases file (Bartels Media PhraseExpress).
.PXR Pixar image file (Adobe Photoshop and many other graphics applications).
.PY Python programming language application or script file (Many variants, many applications).
.PY Python script file (Timothy M Shead's K-3D 0.8).
.PYC Python cache file (Stichting Blender Foundation's Blender).
.PYD Python file (Many variants and applications).
.PYO Python file (Many variants and applications).
.PYPROJ Python Project file (sharpdevelop.net's JSharp Develop 4).
.PYW Python file (Many variants and applications).
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