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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .P1C | IBM | Uncommon Files | IBM Voice Type Language Newuser File | IBM Embedded ViaVoice | IBM |
| .P1I | IBM | Uncommon Files | IBM Voice Type Language Newuser File | IBM Embedded ViaVoice | IBM |
| .P2C | IBM | Data Files | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .PCJ | IBM | Graphic Files | IBM LinkWay Graphics Data | IBM LinkWay | IBM |
| .PFL | PlotSoft | Page Layout Files | PDFill Project File | Lotus 1-2-3 | IBM |
| .PHD | CyberLink | Data Files | PhotoDirector Project File | HeapRoots | IBM |
| .PKX | IBM | Data Files | Rational XDE Data | Rational Rose | IBM |
| .PLI | IBM | Developer Files | PL/I Source Code File | PL/I for VSE/ESA | IBM |
| .PLZ | IBM | Graphic Files | Lotus Freelance Presentation | Lotus Freelance Graphics | IBM |
| .POR | IBM | Data Files | SPSS Portable File | IBM SPSS | IBM |
| .POS | Trimble Inc. | Data Files | Trimble Position File | IBM Lotus Notes | IBM |
| .POTX | Microsoft Corporation | Data Files | PowerPoint Open XML Presentation Template | IBM Lotus Symphony | IBM |
| .PPR | IBM | Data Files | Cognos PowerPlay Report File | Cognos PowerPlay | IBM |
| .PPT | Microsoft Corporation | Data Files | PowerPoint Presentation | IBM Lotus SmartSuit | IBM |
| .PPX | Serif | Page Layout Files | Serif PagePlus Template File | Cognos PowerPlay | IBM |
| .PRC | Adobe Systems Incorporated | 3D Image Files | Product Representation Compact File | Rational Rose | IBM |
| .PRF | Microsoft Corporation | Settings Files | Outlook Profile File | FileNet eForms | IBM |
| .PRN | Various Developers | Page Layout Files | HP PCL Printer Output | Lotus 1-2-3 | IBM |
| .PRP | IBM | Data Files | Rational Model Properties File | IBM Rational Rose development software | IBM |
| .PRU | IBM | Data Files | IBM Tivoli Storage Manager Pruned Entry Data | Tivoli Storage Manager | IBM |
| .PRZ | IBM | Data Files | Freelance Graphics Presentation File | Freelance Mobile Screen Show Player | IBM |
| .PSG | IBM | Page Layout Files | Page Segment File | AFP Workbench Viewer | IBM |
| .PTL | IBM | Developer Files | Rational Rose Petal File | IBM Rational Rose development software | IBM |
| .PTY | IBM | Developer Files | Rational Property Set | Rational Rose | IBM |
| .PYI | IBM | Data Files | IBM Cognos 7 File | IBM Cognos Business Intelligence | IBM |
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