| .PUBXML | Microsoft Corporation | Gegevensbestanden | Microsoft Visual Studio Publish Profile | Microsoft Visual Studio | Microsoft Corporation |
| .PUL | HEKA | Gegevensbestanden | PATCHMASTER Pulsed Tree Data | PATCHMASTER | HEKA |
| .PUR | Idyllic Pixel | Gegevensbestanden | PureRef Save File | PureRef | Idyllic Pixel |
| .PVA | Hauppauge Computer Works | Gegevensbestanden | Hauppauge DVB-Software File | Hauppauge DVB-Software | Hauppauge Computer Works |
| .PVB | VirtualBoss, Inc. | Gegevensbestanden | VirtualBoss PocketPC Data | VirtualBoss | VirtualBoss, Inc. |
| .PVD | Varden Development | Gegevensbestanden | Polygen3D Vector Descriptor | Polygen3D | Varden Development |
| .PVF | Authentica, Inc. | Gegevensbestanden | PageVault/PageRecall File | Authentica PageRecall | Authentica, Inc. |
| .PVG | Microsoft Corporation | Gegevensbestanden | Encarta World Atlas Data File | Microsoft Encarta | Microsoft Corporation |
| .PVI | Canon Inc. | Gegevensbestanden | Canon Picture Browser Cache Index | Unknown Software | Unknown Developer |
| .PVL | Unknown Developer | Gegevensbestanden | Instalit Library | HPI Instalit | Unknown Developer |
| .PVT | Tom Jennings | Gegevensbestanden | Local Fidonet Pointlist | Fidonet | Tom Jennings |
| .PVU | NOAA | Gegevensbestanden | PaleoVu Paleoenvironmental Data File | PaleoVu | NOAA |
| .PVW | Outram Research Ltd | Gegevensbestanden | Pronto For Windows Data View File | Pronto for Windows | Outram Research Ltd |
| .PWB | PasswordBoss, LLC | Gegevensbestanden | Password Boss Data | Password Boss | PasswordBoss, LLC |
| .PWE | ACCA Software | Gegevensbestanden | PriMus Exchange Document | ACCA Software PriMus-DCF | ACCA Software |
| .PWK | Gregory Braun | Gegevensbestanden | Password Keeper Password Database | Password Keeper | Gregory Braun |
| .PWN | CompuPhase | Gegevensbestanden | Pawn Source Code File | SA-MP Editor | Open Source |
| .PWP | Seattle FilmWorks | Gegevensbestanden | PhotoWorks Image File | XnView MP | XnSoft |
| .PWX | TrainingPeaks | Gegevensbestanden | PowerAgent Exported Workout Data | Poweragent | TrainingPeaks |
| .PX | Pixela Corporation | Gegevensbestanden | Pixel Image File | Pixel image editor | Softonic Corporate |
| .PXA | Bartels Media GmbH | Gegevensbestanden | Autotext PhraseExpress Phrase File | PhraseExpress for iOS | Bartels Media GmbH |
| .PXC | Photodex | Gegevensbestanden | Photodex Cache File | Photodex ProShow | Photodex |
| .PXF | STAR Group | Gegevensbestanden | Transit XV Pack Project File | Star Group Transit NXT | STAR Group |
| .PXJ | Roxio | Gegevensbestanden | RecordNow Project | Roxio RecordNow Music Lab | Roxio |
| .PXK | Statistics Finland | Gegevensbestanden | PX-Edit Metadata | PX-Edit | Statistics Finland |
| .PXL | Microsoft Corporation | Gegevensbestanden | Pocket Excel File | NeoOffice | Planamesa Software Inc. |
| .PYI | IBM | Gegevensbestanden | IBM Cognos 7 File | IBM Cognos Business Intelligence | IBM |
| .PYS | Microsoft Corporation | Gegevensbestanden | Microsoft Console Based Script Host File | Microsoft Windows | Microsoft Corporation |
| .PZA | MGI Software | Gegevensbestanden | PhotoSuite Album File | PhotoSuite | MGI Software |
| .PZD | CAD Zone, Inc | Gegevensbestanden | Pocket Zone Drawing | Pocket Zone | CAD Zone, Inc |
| .PZH | Soft S.A. | Gegevensbestanden | Presto File | WinRAR | Eugene Roshal |
| .Q | Open Source | Gegevensbestanden | Tinn-R Editor Data | Tinn-R Editor | Open Source |
| .Q00 | Intuit, Inc. | Gegevensbestanden | Quicken 2000 Tax Return | Intuit Quicken | Quicken |
| .Q07 | Intuit, Inc. | Gegevensbestanden | QuickTax 2007 Tax Return Data | Quicktax Suite | Intuit, Inc. |
| .Q08 | Intuit, Inc. | Gegevensbestanden | QuickTax 2008 Tax Return | Quicktax Suite | Intuit, Inc. |
| .Q3D | Act-3D | Gegevensbestanden | Quest3D Project File | Quest3D | Act-3D |
| .Q43 | Unknown Developer | Gegevensbestanden | Aqbanking Q43 File Format | AqBanking | Open Source |
| .Q4W | Nutek, Inc. | Gegevensbestanden | Qualitek-4 Exported Data | Qualitek-4 | Nutek, Inc. |
| .Q99 | Quicken | Gegevensbestanden | Quicken 99 File | Intuit Quicken | Quicken |
| .QAF | Image Intelligence Software | Gegevensbestanden | Qedoc Quiz Player Autolaunch Data | Qedoc Quiz Player | Image Intelligence Software |
| .QB | Blackboard Collaborate | Gegevensbestanden | Diploma Question Bank File | Wimba Diploma | Blackboard Collaborate |
| .QB1 | Quicken | Gegevensbestanden | Quicken Data | Intuit Quicken | Quicken |
| .QB2013 | Intuit, Inc. | Gegevensbestanden | QuickBooks 2013 File | Intuit QuickBooks for Mac | Intuit, Inc. |
| .QBA | Intuit, Inc. | Gegevensbestanden | QuickBooks Accountant's Copy Work File | Intuit QuickBooks Pro | Intuit, Inc. |
| .QBE | Corel | Gegevensbestanden | Corel Quattro Pro Saved Query File | Corel Quattro Pro | Corel |
| .QBJ | Intuit, Inc. | Gegevensbestanden | QuickBooks General Journal Entry File | QuickBooks | Intuit, Inc. |
| .QBL | Broderbund | Gegevensbestanden | Business Lawyer Document Files | Home & Business Lawyer | Broderbund |
| .QBO | Intuit, Inc. | Gegevensbestanden | QuickBooks Online Bank Statement File | FreshBooks | FreshBooks Company |
| .QBR | Intuit, Inc. | Gegevensbestanden | QuickBooks Report Template | QuickReport | QBS Software |
| .QBS | Microsoft Corporation | Gegevensbestanden | Microsoft QuickBasic Program File | QuickBASIC | Microsoft Corporation |
| .QBW | Intuit, Inc. | Gegevensbestanden | QuickBooks Data File | Intuit QuickBooks Pro | Intuit, Inc. |
| .QBXML | Intuit, Inc. | Gegevensbestanden | QuickBooks XML Format File | Zed Axis | Zed Systems |
| .QCA | Sony Mobile Communications | Gegevensbestanden | Ericsson Phone Doubler Quick Call Data | Ericsson Phone Doubler Quick Call | Sony Mobile Communications |
| .QCALL | Sony Mobile Communications | Gegevensbestanden | Phone Doubler Quick Call File | Ericsson Phone Doubler Quick Call | Sony Mobile Communications |
| .QCC | Niobrara R&D Corporation | Gegevensbestanden | NIOBRARA QUCM Firmware File | Unknown Software | Unknown Developer |
| .QCH | Quicken | Gegevensbestanden | Quicken DOS Data File | Intuit Quicken | Quicken |
| .QCK | Esoteric Technologies | Gegevensbestanden | Jigsaw 2 Astrological Tool File | JigSaw | Esoteric Technologies |
| .QCM | Unknown Developer | Gegevensbestanden | Quick Command Data | Unknown Software | Unknown Developer |
| .QD | SourceForge | Gegevensbestanden | SHARP MZ-series Emulator Data | Sharp MZ-800 Emulator | SourceForge |
| .QDAT | Apple | Gegevensbestanden | QuickTime Install Cache File | Apple QuickTime Player | Apple |
| .QDB | Intuit, Inc. | Gegevensbestanden | Quicken 5 & 6 Data File | Intuit Quicken | Quicken |
| .QDF | Ringler Informatik AG | Gegevensbestanden | Snapform File | Snapform Designer | Ringler Informatik AG |
| .QDP | NASA | Gegevensbestanden | Quick And Dandy Plotter File | Quick and Dandy Plotter (QDP) | NASA |
| .QEF | Microsoft Corporation | Gegevensbestanden | Microsoft Excel Query File | Microsoft Excel | Microsoft Corporation |
| .QEL | Intuit, Inc. | Gegevensbestanden | Quicken Electronic Library File | Intuit Quicken | Quicken |
| .QEM | ExpensAble | Gegevensbestanden | ExpensAble Report File | ExpensAble Office | ExpensAble |
| .QES | Askia SAS | Gegevensbestanden | Askiadesign Questionnaire File | Askiadesign | Askia SAS |
| .QEX | ExpensAble | Gegevensbestanden | ExpensAble Data File | ExpensAble Office | ExpensAble |
| .QF | Nokia | Gegevensbestanden | Nokia (Ovi) Maps Version Data | Microsoft Notepad | Microsoft Corporation |
| .QFD | Quicken | Gegevensbestanden | Quicken Data | Intuit Quicken | Quicken |
| .QFL | Nolo | Gegevensbestanden | Family Lawyer Document | Nolo Quicken WillMaker | Nolo |
| .QFX | Intuit, Inc. | Gegevensbestanden | Quicken Financial Exchange File | Intuit Quicken | Quicken |
| .QHF | Ilgam Zyulkorneev | Gegevensbestanden | QIP Saved History File | QIP | Ilgam Zyulkorneev |
| .QID | Quicken | Gegevensbestanden | Quicken File | Intuit Quicken | Quicken |
| .QIF | Intuit, Inc. | Gegevensbestanden | Quicken Interchange Format File | Intuit Quicken | Quicken |
| .QIP | Ilgam Zyulkorneev | Gegevensbestanden | QIP Infium Account File | QIP | Ilgam Zyulkorneev |
| .QL | Robelle | Gegevensbestanden | QEdit Data | QEDIT | Robelle |
| .QLC | Adobe Systems Incorporated | Gegevensbestanden | Adobe PostScript Help File | Adobe Creative Suite | Adobe Systems Incorporated |
| .QLD | Waters Corporation | Gegevensbestanden | MassLynx Quantation Data | MassLynx | Waters Corporation |
| .QLV | QGIS (Quantum GIS) | Gegevensbestanden | QGIS LayerVersion Data | QGIS | QGIS (Quantum GIS) |
| .QM | Digia Oyj | Gegevensbestanden | Qt Compiled Translation Source File | Nokia Qt Linguist | Nokia |
| .QMA | Robelle | Gegevensbestanden | QEDIT Data File | QEDIT | Robelle |
| .QMB | Matthieu Godon | Gegevensbestanden | Quick Menu Builder Saved File | Quick Menu Builder | Matthieu Godon |
| .QMBL | Vernier Software & Technology | Gegevensbestanden | LabQuest Results Data | Vernier Logger Pro | Vernier Software & Technology |
| .QME | Intuit, Inc. | Gegevensbestanden | Quicken Win V3 Data | Intuit Quicken | Quicken |
| .QMO | inData | Gegevensbestanden | TrialDirector Object Load List | TrialDirector | inData |
| .QMR | Steve Sneed | Gegevensbestanden | OzWin Quickscan History File | OzWin | Steve Sneed |
| .QMSB | Questionmark | Gegevensbestanden | Questionmark Secure Data | Secure | Questionmark |
| .QMV | QVOD Technology | Gegevensbestanden | Qvod Player Data | QVOD Player | QVOD Technology |
| .QPB | Intuit, Inc. | Gegevensbestanden | QuickBooks Point Of Sale Data File | QuickBooks Point of Sale | Intuit, Inc. |
| .QPF | Act-3D | Gegevensbestanden | Quest3D Project File | Quest3D | Act-3D |
| .QPH | Digia Oyj | Gegevensbestanden | Qt Phrase Books File | Qt SDK | The Qt Company |
| .QPK | Unknown Developer | Gegevensbestanden | Qt Extended Installable Package | Qt Extended | Open Source |
| .QPL | Synergy Software | Gegevensbestanden | KaleidaGraph Layout File | KaleidaGraph | Synergy Software |
| .QPP | BenQ | Gegevensbestanden | QPresenter Pro Presentation | QPresenter Pro | BenQ |
| .QPS | Open Source | Gegevensbestanden | CUTEr QPS Model | CUTEr | Open Source |
| .QR2 | Embarcadero Technologies | Gegevensbestanden | Delphi Database Quick Report | Delphi (IDE) | Embarcadero Technologies |
| .QRC | Quark Software Inc. | Gegevensbestanden | QuarkXPress Required Component File | QuarkXPress | Quark Software Inc. |
| .QRD | Hummingbird Ltd. | Gegevensbestanden | BI/Query Result Data | BI Query Chart Editor | Hummingbird Ltd. |
| .QRL | Quality First Software | Gegevensbestanden | QF-Test Run Log | QF-Test | Quality First Software |
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