| .J1 | Unknown Developer | Gegevensbestanden | EDIT Compiler JEDEC Boundary File | Unknown Software | Unknown Developer |
| .JASPER | Jaspersoft | Gegevensbestanden | JasperReports Data File | JasperReports | Jaspersoft |
| .JAW | JustSystems | Gegevensbestanden | Ichitaro File | Ichitaro | JustSystems |
| .JBB | Damian Brunold | Gegevensbestanden | Jbead Data | Jbead | Damian Brunold |
| .JBD | Symantec Corporation | Gegevensbestanden | Norton Antivirus Definiton Update File Format | Norton Security | Symantec Corporation |
| .JBI | Yaskawa Motoman | Gegevensbestanden | Motoman Robot Job File | MotoPallet EG | Yaskawa Motoman |
| .JBW | Scitor | Gegevensbestanden | Scitor Project Scheduler Schedule Data | Project Scheduler | Scitor |
| .JBX | Unknown Developer | Gegevensbestanden | Project Scheduler Data | Unknown Software | Unknown Developer |
| .JCAMP | Joint Committee on Atomic and Molecular Physical Data (JCAMP-DX ) | Gegevensbestanden | JCAMP Standard NMR Data Format | Unknown Software | Unknown Developer |
| .JCC | Open Source | Gegevensbestanden | Code Crusader Project Data | Code Crusader | Open Source |
| .JCD | Hou Yantang | Gegevensbestanden | FlashGet Saved Data | FlashGet | Hou Yantang |
| .JCE | Glenn Rosenthal | Gegevensbestanden | JWPce File | JWPce | Glenn Rosenthal |
| .JCK | Microsoft Corporation | Gegevensbestanden | Microsoft Liquid Motion JACK Scene Escription | Liquid Motion | Microsoft Corporation |
| .JCV | JC Video | Gegevensbestanden | JC Video Systems Data | Unknown Software | Unknown Developer |
| .JD | Orchid Technology KK | Gegevensbestanden | Jigsaw Terminal File | Jigsaw Platform | Orchid Technology KK |
| .JDB | Symantec Corporation | Gegevensbestanden | Symantec Endpoint Protection Update File | Symantec EndPoint Protection 12 | Symantec Corporation |
| .JDBG | Open Source | Gegevensbestanden | Embedded JCL Debug Information | Project JEDI | Open Source |
| .JDL | European Grid Infrastructure | Gegevensbestanden | gLite Job Description Language File | gLite | European Grid Infrastructure |
| .JDT | Adobe Systems Incorporated | Gegevensbestanden | Accelio Capture Classic Filler Data | Accelio Capture Classic Filler | Adobe Systems Incorporated |
| .JDX | Page Scholar Inc | Gegevensbestanden | JSpell Dictionary File | JSpell | Page Scholar Inc |
| .JEF | Janome Sewing Machine Co., Ltd. | Gegevensbestanden | Janome Embroidery Format | Janome Customizer 11000 | Janome Sewing Machine Co., Ltd. |
| .JFD | Freedom Scientific | Gegevensbestanden | JAWS Synopsis Data | JAWS | Freedom Scientific |
| .JGD | Corel | Gegevensbestanden | Corel PaintShop Photo Pro Gradients File | PaintShop Pro | Corel |
| .JGF | Freedom Scientific | Gegevensbestanden | JAWS Ini File | JAWS | Freedom Scientific |
| .JIO | INRIA | Gegevensbestanden | Join-Calculus JCC Compiled Interface | Join-Calculus | INRIA |
| .JLP | Neowin | Gegevensbestanden | Jumplist Extender File | Jumplist Extender | Neowin |
| .JMP | SAS Institute Inc. | Gegevensbestanden | JMP Data File | SAS | SAS Institute Inc. |
| .JMS | Half-Baked Software | Gegevensbestanden | Masher Project | Hot Potatoes | Half-Baked Software |
| .JNL | Actian Corporation | Gegevensbestanden | Ingres Journal File | Ingres Database | Actian Corporation |
| .JNT | Microsoft Corporation | Gegevensbestanden | Windows Journal File | Microsoft Windows Journal | Microsoft Corporation |
| .JOB | Metamation | Gegevensbestanden | MetaCAM Nest Job File | MetaCAM Nesting | Metamation |
| .JOBOPTIONS | Adobe Systems Incorporated | Gegevensbestanden | Adobe Joboptions File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JOC | ConTEXT Project | Gegevensbestanden | Context4 DOS Word Processor File | ConTEXT | ConTEXT Project |
| .JOINED | Freebyte | Gegevensbestanden | HJ-Split Data File | Freebyte HJSplit for Java | Håkan Gustavsson |
| .JOT | King Stairs | Gegevensbestanden | Jot+ Notes Note Data | Jot+ Notes | King Stairs |
| .JP4 | Open Source | Gegevensbestanden | Elphel Project Data | Elphel Project | Open Source |
| .JP5 | Electric Quilt | Gegevensbestanden | Electric Quilt Data | Electric Quilt | Electric Quilt |
| .JPC | Joint Photographic Experts Group | Gegevensbestanden | JPEG 2000 Code Stream File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPF | Joint Photographic Experts Group | Gegevensbestanden | JPEG 2000 Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPH | Quest Software | Gegevensbestanden | JProbe Memory Snapshot File | JProbe | Quest Software |
| .JPL | Sonic Foundry | Gegevensbestanden | Siren Jukebox File | Siren Jukebox | Sonic Foundry |
| .JPN | Microsoft Corporation | Gegevensbestanden | Windows Japanese Noise-Word List File | Microsoft Notepad | Microsoft Corporation |
| .JPT | Quest Software | Gegevensbestanden | Jprobe Threadalyzer Memory Snapshot | JProbe | Quest Software |
| .JPX | Embarcadero Technologies | Gegevensbestanden | JBuilder Project | JBuilder | Embarcadero Technologies |
| .JQX | Microsoft Corporation | Gegevensbestanden | Microsoft Windows Help-Related File | Microsoft Windows | Microsoft Corporation |
| .JRXML | Jaspersoft | Gegevensbestanden | JasperReports Layout File | iReport Designer | Jaspersoft |
| .JSD | Jazer Solutions | Gegevensbestanden | Jazer Data File | Jazer | Jazer Solutions |
| .JSF | Adobe Systems Incorporated | Gegevensbestanden | Java Script Command File | Adobe Fireworks | Adobe Systems Incorporated |
| .JSK | Cowon Systems | Gegevensbestanden | JetAudio File | jetAudio | Cowon Systems |
| .JSM | Mozilla | Gegevensbestanden | Firefox JavaScript Module | Mozilla Firefox | Mozilla |
| .JSML | Physiome Project | Gegevensbestanden | JSim Model File | JSim | Physiome Project |
| .JSONLD | Microsoft Corporation | Gegevensbestanden | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .JSPROJ | Microsoft Corporation | Gegevensbestanden | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .JTB | Wanjun Wang | Gegevensbestanden | JTB JavaCC Grammar Data | JTB | Wanjun Wang |
| .JTL | Apache Software Foundation | Gegevensbestanden | JMeter Test Results Data File | Apache JMeter | Apache Software Foundation |
| .JW | Microsoft Corporation | Gegevensbestanden | Microsoft WordPad Document | Microsoft WordPad | Microsoft Corporation |
| .JWG | Oracle Corporation | Gegevensbestanden | Java Data | Java | Oracle Corporation |
| .JWL | Roxio | Gegevensbestanden | Roxio Jewel Case File | Roxio Creator NXT Pro 5 | Roxio |
| .JWP | Sonic Solutions | Gegevensbestanden | Easy CD Creator Label File | Roxio Easy CD Creator | Roxio |
| .JWR | Rocket Software | Gegevensbestanden | LegaSuite GUI J Walk Runtime Data | LegaSuite | Rocket Software |
| .JWRP | Benoit Widemann | Gegevensbestanden | JoliWrite File | JoliWrite | Benoit Widemann |
| .JWW | Open Source | Gegevensbestanden | Java Web-Workflows Data | Java Web-Workflows | Open Source |
| .JXX | Yamaha Corporation | Gegevensbestanden | Yamaha SY77 Audio Data File | Yamaha SY77 | Yamaha Corporation |
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