| .P65 | Adobe Systems Incorporated | Sideopsætningsfiler | Adobe PageMaker 6.5 Document | Adobe InDesign | Adobe Systems Incorporated |
| .PA | Nova Development | Sideopsætningsfiler | Print Artist Project File | Print Artist | Sierra Entertainment |
| .PBX | Sybase, Inc | Sideopsætningsfiler | PowerBuilder Extension File | PowerBuilder | SAP |
| .PCL | Hewlett-Packard | Sideopsætningsfiler | Printer Command Language Document | PCLTool | Page Technology Marketing, Inc |
| .PCT | Apple | Sideopsætningsfiler | Macintosh PICT Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .PDF | Adobe Systems Incorporated | Sideopsætningsfiler | Portable Document Format File | LibreOffice | The Document Foundation |
| .PDG | Broderbund | Sideopsætningsfiler | Print Shop Deluxe Design File | The Print Shop | Broderbund |
| .PDM | Sybase, Inc | Sideopsætningsfiler | PowerDesigner Database File | Sybase PowerDesigner | SAP |
| .PDP | Palo Alto Software | Sideopsætningsfiler | Palo Alto Software Plan Component File | Business Plan Pro | Palo Alto Software |
| .PDR | Microsoft Corporation | Sideopsætningsfiler | Windows Port Driver | Windows Control Panel | Microsoft Corporation |
| .PDW | AcaClone | Sideopsætningsfiler | pDRAW32 DNA File | pDRAW32 DNA analysis | AcaClone |
| .PDZ | ProntoForms | Sideopsætningsfiler | ProntoDoc For Word Structured Text Document Template | Microsoft Word | Microsoft Corporation |
| .PEX | Schlumberger Limited | Sideopsætningsfiler | Merak Peep Data File | Merak Peep | Schlumberger Limited |
| .PFF | Access | Sideopsætningsfiler | Formatta Portable Form File | Access Formatta Filler | Access |
| .PFL | PlotSoft | Sideopsætningsfiler | PDFill Project File | PlotSoft PDFill | PlotSoft |
| .PGS | Grasshopper LLC | Sideopsætningsfiler | PageStream Document | PageStream | Grasshopper LLC |
| .PICT | Apple | Sideopsætningsfiler | Macintosh PICT Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .PM4 | Adobe Systems Incorporated | Sideopsætningsfiler | PageMaker 4 Document | Adobe PageMaker | Adobe Systems Incorporated |
| .PM5 | Adobe Systems Incorporated | Sideopsætningsfiler | PageMaker 5.0 Document | Adobe PageMaker | Adobe Systems Incorporated |
| .PM6 | Adobe Systems Incorporated | Sideopsætningsfiler | PageMaker 6.0 Document | Adobe InDesign | Adobe Systems Incorporated |
| .PMD | Adobe Systems Incorporated | Sideopsætningsfiler | PageMaker Document | Adobe InDesign | Adobe Systems Incorporated |
| .PMI | David Harris | Sideopsætningsfiler | Pegasus Mail Folder Index | Pegasus Mail | David Harris |
| .PMX | Yu Higuchi | Sideopsætningsfiler | MikuMikuDance Model File | MikuMikuDance | Yu Higuchi |
| .PNX | David Harris | Sideopsætningsfiler | Pegasus Mail Draft Message | Pegasus Mail | David Harris |
| .PPP | Serif | Sideopsætningsfiler | Serif PagePlus Document | PagePlus | Serif |
| .PPX | Serif | Sideopsætningsfiler | Serif PagePlus Template File | PagePlus | Serif |
| .PR3 | Adobe Systems Incorporated | Sideopsætningsfiler | Adobe Persuasion V3 Presentation | Adobe Persuasion | Adobe Systems Incorporated |
| .PRA | SofTech, Inc. | Sideopsætningsfiler | CADRA Design Drafting Software Data | CADRA | SofTech, Inc. |
| .PRN | Various Developers | Sideopsætningsfiler | HP PCL Printer Output | Canvas X | ACD Systems |
| .PSG | IBM | Sideopsætningsfiler | Page Segment File | AFP Workbench Viewer | IBM |
| .PSPROJ | Broderbund | Sideopsætningsfiler | The Print Shop Project File | The Print Shop | Broderbund |
| .PSR | Sybase, Inc | Sideopsætningsfiler | Powersoft Report File | PowerBuilder | SAP |
| .PTX | Adobe Systems Incorporated | Sideopsætningsfiler | PageMaker Template File | Adobe InDesign | Adobe Systems Incorporated |
| .PUB | Microsoft Corporation | Sideopsætningsfiler | Microsoft Publisher Document | LibreOffice | The Document Foundation |
| .PUI | Poster Software, LLC | Sideopsætningsfiler | Publish-iT Document | Publish-iT | Poster Software, LLC |
| .PWT | Autodesk, Inc. | Sideopsætningsfiler | AutoCAD Publish To Web Template | Autodesk AutoCAD | Autodesk, Inc. |
| .PZF | GraphPad Software | Sideopsætningsfiler | GraphPad Prism Project | GraphPad Prism | GraphPad Software |
| .PZFX | GraphPad Software | Sideopsætningsfiler | GraphPad Prism XML Project | GraphPad Prism | GraphPad Software |
| .PZM | GraphPad Software | Sideopsætningsfiler | GraphPad Prism Project | GraphPad Prism | GraphPad Software |
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