P

File extensions starting with the letter P...

  .P    PASCAL Program File
        Applause Picture
        Progress 4GL Program
  .P01  IsoBuster File
  .P10  Tektronix Plot 10 Drawing
        Certificate Request
  .P65  Pagemaker 6.5 File
  .P7C  Digital ID File
  .P7M  PKCS #7 MIME Message (see Section 3.2 in RFC 2311  [MIME]
  .P7R  Certificate Request Response
  .P7S  PKCS #7 Signature
  .PAB  MS Personal Address Book
  .PAC  SB Studio II Package
  .PAD  Telemate Keypad Definition
  .PAF  PARIS Audio Format
  .PAG  Property Page File
  .PAK  Compressed Archive File
        Quake WAD File
  .PAL  Color Palette
        Adobe Pagemaker Library Palette
        Tree Professional Palm Creator File
        Compressed File
  .PAN  Chromeleon Control Panel
  .PAP  Tree Professional Palm Creator Image File
  .PAR  Fractint Parameter File
  .PAS  Pascal Source Code
  .PAT  AutoCAD Hatch Pattern
        Patch
        Corel Vector Pattern
        Advanced Gravis Ultrasound
        Forte Tech. Patch
  .PB   WinFax Pro Phone Book
  .PBD  PowerBuilder Dynamic Library
        Faxit Phone Book
  .PBF  Turtle Beach Pinnacle Bank File
  .PBI  Profiler Binary Input  
  .PBK  MS Phonebook
  .PBL  PowerBuilder Library
  .PBM  UNIX Portable Bit Map Graphic  [Viewer]
  .PBR  PowerBuilder Resource
  .PBO  Profiler Binary Output  
  .PBT  Profiler Binary Table  
  .PC   PC-specific Text File
  .PC3  Harvard Custom Palette (Harvard Graphics taken over by Serif)
  .PC5  Rockwell Software Logix 5 File
  .PC8  ASCII Text IBM-8
  .PCA  PCAnywhere Registry Backup
  .PCB  Protel Technology Advanced PCB Design
        MS PowerPoint Application Data File
  .PCC  Image File
  .PCD  Photo-CD Image  [Viewer]
        P-Code Compiled Test Scripts
  .PCE  Eudora Mailbox Name Map
  .PCF  Profiler Command File  
  .PCH  Patch File
        MS C PreCompiled Header
  .PCK  Turbo Pascal Pick File
  .PCL  HP Printer Control Language [SwiftView]
  .PCM  Sound File
        OKI MSM6376 Synth Chip PCM Format
  .PCP  Symantec Live Update Pro
  .PCS  PICS Animation
  .PCT  Bitmap Graphic (Apple PICT Format Usually)
  .PCW  PC Write Text File
  .PCX  PC Paintbrush Bitmap Graphic  [Viewer] [SwiftView]
  .PDB  Palmpilot Database/Document File
        Pegasus DataBase
        Tact File
        QuickPOS Database File
  .PDD  Adobe PhotoDeluxe Image
  .PDF  Printer Description
        Adobe Acrobat File
        Netware Printer Definition File
        MS Package Definition File (Inventory-related)
  .PDG  PrintShop Deluxe File
  .PDI  MS Powerpoint File
  .PDM  Sybase Power Designer File
  .PDQ  Patton & Patton Flowcharting PDQ Lite File
  .PDR  Port or Printer Driver
  .PDS  PDS Graphic
        Telsis HiCall Program File
  .PDT  ProCite Primary Database
  .PDV  Paintbrush Printer Driver
  .PDX  Paradox Files
        ProCite Database Keys
        Acrobat Catalog Index
  .PEB  WordPerfect Program Editor Bottom Overflow File
  .PED  WordPerfect Program Editor Delete Save
  .PEM  WordPerfect Program Editor Macro
  .PEQ  WordPerfect Program Editor Print Queue File
  .PER  WordPerfect Program Editor Resident Area
  .PES  WordPerfect Program Editor Work Space File
  .PET  WordPerfect Program Editor Top Overflow File
        Custom CD Menu
  .PF   Monitor or Printer Profile File
        Aladdin Systems Private Files Encrypted File
        Progress Parameter File
  .PFA  Outline Font (ASCII)
  .PFB  Outline Font (Binary)
  .PFC  PF Component
  .PFE  Programmers File Editor
  .PFK  XTree Programmable Function Keys
  .PFM  Printer Font Metrics
  .PFP  Panorama Factory Project File
  .PFR  PaintShop Pro File
  .PFT  Chiwriter Printer Font
  .PGD  Pretty Good Privacy Virtual Disk File
  .PGL  Graphics (Plotter)
  .PGM  Portable Graymap Graphic  [Viewer]
        Chromeleon Batch Program
  .PGN  Portable Game Notation (Used for chess)
  .PGP  Program Parameter
        Pretty Good Privacy
  .PGX  Binary Property Page File
  .PH   PERL Header
        MS Help Compiler Phrase Table
  .PHD  PC Help Desk File
  .PHO  Phone List
  .PHP  PHP Script  [Also .PHP3 & .PHP4]
        MS Picture It! Publishing Project File
  .PHR  NoExcuse Phrase Checker
        LocoScript Phrases
  .PHT  Partial Hypertext File (HTML fragments compiled into a whole)
  .PIC  PC Paint Bitmap Graphic
        Lotus Picture
        Macintosh PICT Drawing
  .PIF  Windows Program Information File
        IBM PIF Drawing
  .PIG  Lucas Arts Dark Forces WAD File
  .PIM  PixMaker Project File
  .PIN  Pushpin Set
        Links Games Player Information File
        Epic Pinball Data File
  .PIT  Macintosh Compressed Archive File
  .PIX  PrintMaster Graphic File
        Inset Systems Bitmap
  .PJ   MKS Source Integrity File
  .PJL  ProCite Term Lists and Journal Title Lists
  .PJT  Foxpro Project Memo
  .PJX  Foxpro Project
  .PK   CoolEdit96 Graphical Waveform [?]
  .PK3  Quake 3 Arena File (Stores maps, etc. and is renamed Zip file)
  .PKA  Compressed Archive File
  .PKB  QuickPOS (Point-Of-Sale) Keyboard Layout File
  .PKG  MS Developer Studio Application Extension
        AppleLink Package Compression Format File
  .PKO  PublicKey Security Object
  .PKR  PGP Public Keyring
  .PL   Harvard Palette (Harvard Graphics taken over by Serif)
        PERL Program File
  .PL3  Harvard Chart Palette (Harvard Graphics taken over by Serif)
  .PLB  Foxpro Library
  .PLB  LogoShow Screensaver
  .PLC  Lotus Add-in
  .PLD  PLD2 Source File (program due out 1Q2001)
  .PLG  REND386/AVRIL File
  .PLI  Oracle 7 Data Description
  .PLL  Prelinked Library
  .PLM  DisorderTracker2 Module
  .PLN  WordPerfect Spreadsheet File
  .PLR  Descent Pilot File
  .PLS  DisorderTracker2 Sample
        WinAmp MPEG PlayList File
        Shoutcast File
        MYOB Data File
  .PLT  AutoCAD HPGL Vector Graphic Plotter File
        HP Graphics Language (plotter) [SwiftView]
        Gerber Sign-making Software File
        Bentley's CAD MicroStation Driver Configuration for Plotting
  .PLY  Autodesk Polygon
  .PM   PM Graphic or Perl Module
  .PM3  PageMaker 3 Document
  .PM4  PageMaker 4 Document
  .PM5  PageMaker 5 Document
  .PM6  PageMaker 6 Document
  .PME  Plazmic Media Engine File
  .PMG  Pagemaker Group File (EPS graphic)
  .PMI  Pegasus Mail Message Folder Index File
  .PML  NT4 Performance Monitor Log File
        Pegasus Mail Distribution List
        PADGen Program Information
  .PMM  Pegasus Mail Mail Message Folder
  .PN3  Harvard Printer Driver (Harvard Graphics taken over by Serif)
  .PND  DATAIR Pension System Pending File
  .PNF  Precompiled Setup Information (Temporary file seen during installs)
  .PNG  Portable (Public) Network Graphic (proposed GIF replacement)  [Viewer]
        PaintShop Pro Browser
  .PNM  PBM Portable Any Map Graphic
  .PNT  MacPaint File
        Paperport Thumbsview
  .POC  PocoScript File
  .POG  Descent2 File
  .POL  Music File
        AscToHTM Policy File
  .POP  dBase Popup Menu
  .POS  ProCite Output Styles
        QuickPOS IIF File (see IIF above)
  .POT  PowerPoint Template
  .POV  Persistence of Vision Ray-tracer
  .PP   Compressed Archive File
  .PP4  Picture Publisher
  .PP5  Picture Publisher
  .PPA  PowerPoint Add-in
  .PPB  WordPerfect Print Preview Button Bar
  .PPD  PostScript Printer Description
  .PPF  Turtle Beach Pinnacle Program File
        Jasc Paint Shop Pro 7 Preset File
  .PPI  MS PowerPoint Graphics File
  .PPL  Harvard Polaroid Palette Plus ColorKey Driver (Harvard Graphics taken over by Serif)
  .PPM  PBM Portable Pixelmap Graphic  [Viewer]
  .PPO  Clipper Preprocessor Output
  .PPP  Serif PagePlus Publication
        Enfocus Preflight Profile
        Parson Power Publisher
  .PPS  PowerPoint Slideshow
  .PPT  PowerPoint Presentation
  .PPX  Serif PagePlus Publication
  .PPZ  PowerPoint Packaged Presentation
  .PQ   Adobe Pagemaker Default Printer Style
  .PQI  Power Quest Drive Imaging Software
  .PQX  Power Quest DRive Image Index
  .PR2  Persuasion Presentation
  .PR2  dBase IV Printer Driver
  .PR3  dBase IV PostScript Printer Driver
        Aldus Persuasion Presentation
  .PRC  Palmpilot Resource File
  .PRD  Printer Driver
  .PRE  Freelance Presentation
  .PRF  Preferences File (various)
        dBase IV Printer Driver
        Profiler Output
        PICS Rules File
  .PRG  Program File (various)
        OzWin Purged Messages File
        WAVmaker Program
  .PRI  LocoScript Printer Definitions
  .PRJ  Project File
        3D Studio File
        HitPlayer Advanced Playlist File
  .PRK  Tony Hawk's Pro Skater 2 Saved Park
  .PRM  Parameter File
  .PRN  Printer Text File
        HP Printer Control Language [SwiftView]
        DataCAD Windows Printer File
        XYWrite Printer Driver
        PostScript File
  .PRO  Profile
        PROLOG Program File
  .PRS  Printer Resource File
        WordPerfect Printer Resource Font File
        dBase Procedure
        Harvard File (Harvard Graphics taken over by Serif)
  .PRT  Printer  Configuration
        Printer-formatted File
        Unigraphics Part File (CAD modeling data)
        Associated with the W32/Parrot-A worm; particularly if found in the
          Windows directory along with .EXE files of the same root name.
  .PRV  PsiMail Internet Provider Template
        Previous Version (used for files that change)
  .PRX  Foxpro Compiler Program
  .PRZ  Freelance Graphics 97 File
  .PS   PostScript  [Ghostscript]
  .PSB  Pinnacle Sound Bank
  .PSD  Photoshop Format  [Viewer]
        Apple Viewer File
  .PSF  Chiwriter PostScript Printer Font
  .PSI  PSION A-law Audio
  .PSM  Turbo Pascal Symbol Table
        Protracker Studio Module Format
        Epic Games Sound Data
  .PSP  PaintShop Pro Image  [Viewer]
  .PST  MS Outlook Personal Folder File
  .PSX  Dirty Little Helper Chat File
  .PSY  PLD2 System File (program due out 1Q2001)
  .PT3  Harvard Device Driver (Harvard Graphics taken over by Serif)
  .PT3  PageMaker Template
  .PT4  PageMaker Template
  .PT5  PageMaker Template
  .PTB  Power Tab Guitar Tablature Editor
  .PTM  PolyTracker Music Module
  .PUB  PGP Public Key Ring
        Ventura Publication
        MS Publisher Document
  .PUF  Puffer Encrypted File
  .PW   Professional Write Text File
  .PWA  Password Agent File
  .PWD  Pocket Word Document
  .PWF  ProCite Workforms
  .PWL  Password List
  .PWP  Photoworks Image File
  .PWZ  PowerPoint Wizard
  .PX   Primary Index
  .PX   Paradox Primer Database Index
  .PXA  Pixia Color Painter File [Japanese]
  .PXL  Pocket Excel Spreadsheet
  .PY   PYTHON Script
        Yahoo Saved Messages
  .PYC  Compiler PYTHON Script
  .PZD  Pizazz Plus File
  .PZM  GraphPad Prism
  .PZO  Pizazz Plus File