| J | Java Source File | Developer Files | 23 | 3 |
| J01 | Akeeba Multi-part Backup Archive | Backup Files | 1 | 1 |
| J1 | EDIT Compiler JEDEC Boundary File | Data Files | 1 | 1 |
| J2A | Jazz Jackrabbit 2 Animation Data | 3D Image Files | 1 | 1 |
| J2B | Jazz Jackrabbit 2 Music Data | Game Files | 1 | 1 |
| J2D | Jazz Jackrabbit Data File |
Game Files
| 2 | 1 |
| J2E | Jazz Jackrabbit 2 Episode File |
Game Files
| 1 | 1 |
| J2H | Jazz Jackrabbit 2 High Scores |
Game Files
| 1 | 1 |
| J2I | Jazz Jackrabbit 2 Internet Server Link File |
Game Files
| 1 | 1 |
| J2K | JPEG 2000 Image | Raster Image Files | 16 | 1 |
| J2L | Jazz Jackrabbit 2 Level File |
Game Files
| 1 | 1 |
| J2S | Jazz Jackrabbit 2 Language Data |
3D Image Files
| 1 | 1 |
| J2T | Jazz Jackrabbit 2 Tile Set |
Game Files
| 1 | 1 |
| J2V | Jazz Jackrabbit 2 Cinematic File | Video Files | 1 | 1 |
| J2W | ArcExplorer World | GIS Files | 1 | 1 |
| J6I | Ricoh Camera Image File | Camera Raw Files | 1 | 1 |
| JA | Jet Archive |
Game Files
| 3 | 2 |
| JAD | Java Application Descriptor File | Uncommon Files | 3 | 1 |
| JAG | Jagex Data File |
Game Files
| 1 | 1 |
| JAM | Leisure Suit Larry Magna Cum Laude Archive File |
Game Files
| 3 | 3 |
| JAN | Janome Digitizer Embroidery Design |
Uncommon Files
| 1 | 1 |
| JAP | Nonogram Puzzle File |
Game Files
| 1 | 1 |
| JAR | Java Archive File | Compressed Files | 8 | 1 |
| JAS | Cheetah3D Model File |
3D Image Files
| 3 | 2 |
| JASC | JAS Compressed Graphic | Graphic Files | 1 | 1 |
| JASPER | JasperReports Data File |
Data Files
| 1 | 1 |
| JAV | Java Source Code |
Developer Files
| 14 | 1 |
| JAVA | Java Source Code |
Developer Files
| 14 | 1 |
| JAVASCRIPT | Unknown File Type |
Uncommon Files
| 1 | 1 |
| JAW | Ichitaro File |
Data Files
| 1 | 1 |
| JB2 | JBIG2 Image |
Raster Image Files
| 2 | 1 |
| JBB | Jbead Data |
Data Files
| 1 | 1 |
| JBC | Jam STAPL Byte-Code File | CAD Files | 3 | 2 |
| JBD | Norton Antivirus Definiton Update File Format |
Data Files
| 2 | 1 |
| JBF | Paint Shop Pro Browser Cache File |
Raster Image Files
| 1 | 1 |
| JBG | Joint Bi-level Image Group File |
Raster Image Files
| 1 | 1 |
| JBI | Motoman Robot Job File |
Data Files
| 4 | 1 |
| JBIG | Joint Bi-level Image Group File |
Raster Image Files
| 1 | 1 |
| JBIG2 | JBIG2 Bitmap Image |
Raster Image Files
| 1 | 1 |
| JBK | Juno Backup File |
Backup Files
| 3 | 2 |
| JBL | Doom Scene Add-on File |
Game Files
| 1 | 1 |
| JBP | Jabaco Project |
Uncommon Files
| 1 | 1 |
| JBR | Paint Shop Pro Brushes File |
Raster Image Files
| 2 | 1 |
| JBW | Scitor Project Scheduler Schedule Data |
Data Files
| 1 | 1 |
| JBX | Project Scheduler Data |
Data Files
| 1 | 1 |
| JC | FlashGet Partial Download |
Uncommon Files
| 1 | 1 |
| JC5 | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| JCAMP | JCAMP Standard NMR Data Format |
Data Files
| 1 | 1 |
| JCB | CB-JCBrooke Song/Module | Audio Files | 1 | 1 |
| JCC | Code Crusader Project Data |
Data Files
| 1 | 1 |
| JCD | FlashGet Saved Data |
Data Files
| 1 | 1 |
| JCE | JWPce File |
Data Files
| 1 | 1 |
| JCF | JAWS Configuration File |
Uncommon Files
| 1 | 1 |
| JCK | Microsoft Liquid Motion JACK Scene Escription |
Data Files
| 1 | 1 |
| JCL | JCloze File |
Uncommon Files
| 1 | 1 |
| JCP | JCreator Project File |
Developer Files
| 2 | 2 |
| JCS | Java Control Source Data |
Developer Files
| 1 | 1 |
| JCT | JCT File |
GIS Files
| 1 | 1 |
| JCV | JC Video Systems Data |
Data Files
| 1 | 1 |
| JCW | JCross File |
Uncommon Files
| 2 | 2 |
| JD | Jigsaw Terminal File |
Data Files
| 1 | 1 |
| JDA | Winphone Fax Send Journal |
Uncommon Files
| 1 | 1 |
| JDB | Symantec Endpoint Protection Update File |
Data Files
| 2 | 2 |
| JDBG | Embedded JCL Debug Information |
Data Files
| 1 | 1 |
| JDF | Adobe Acrobat Job Definition File | Settings Files | 3 | 3 |
| JDL | gLite Job Description Language File |
Data Files
| 1 | 1 |
| JDP | BlackBerry JDE Data |
Uncommon Files
| 1 | 1 |
| JDR | IROAD Dash Cam Video File |
Video Files
| 1 | 1 |
| JDT | Accelio Capture Classic Filler Data |
Data Files
| 1 | 1 |
| JDX | JSpell Dictionary File |
Data Files
| 2 | 2 |
| JED | Xilinix JEDEC Programming File |
Developer Files
| 1 | 1 |
| JEF | Janome Embroidery Format |
Data Files
| 2 | 1 |
| JEQ | JetAudio Equalizer Settings |
Settings Files
| 1 | 1 |
| JET | JET Database File | Database Files | 1 | 1 |
| JFA | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| JFD | JAWS Synopsis Data |
Data Files
| 2 | 2 |
| JFF | JAWS INI Data |
Settings Files
| 2 | 2 |
| JFG | User Specific Information File |
Uncommon Files
| 1 | 1 |
| JFI | JPEG File Interchange Image |
Raster Image Files
| 8 | 1 |
| JFIF | JPEG File Interchange Format |
Raster Image Files
| 10 | 1 |
| JFW | JPEG World File |
GIS Files
| 4 | 1 |
| JFX | J2 jConnect Fax File |
Raster Image Files
| 1 | 1 |
| JG6 | BigJig Jigsaw Data |
Game Files
| 1 | 1 |
| JGB | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| JGC | JGCGen Script |
Uncommon Files
| 1 | 1 |
| JGD | Corel PaintShop Photo Pro Gradients File |
Data Files
| 1 | 1 |
| JGF | JAWS Ini File |
Data Files
| 1 | 1 |
| JGG | Unknown File Type |
Uncommon Files
| 1 | 1 |
| JGP | QWS3270 PLUS Session Parameter Data |
Settings Files
| 1 | 1 |
| JGS | QWS3270 PLUS Script File |
Uncommon Files
| 1 | 1 |
| JGW | JPEG World File |
GIS Files
| 4 | 1 |
| JHD | Jagannatha Hora Document | Text Files | 1 | 1 |
| JHTM | Dynamo Server Page |
Uncommon Files
| 1 | 1 |
| JHTML | Java HTML Web Page | Web Files | 11 | 1 |
| JIF | JPEG Image |
Raster Image Files
| 32 | 1 |
| JIG | GameHouse Puzzle Jigsaw Game Data |
Game Files
| 2 | 2 |
| JIGDO | Jigsaw Download Instruction File |
Compressed Files
| 1 | 1 |
| JIGSAW | Jigsaw Explorer Puzzle |
Game Files
| 1 | 1 |
| JIM | JIRA Importers Plugin | Plugin Files | 1 | 1 |
| JIO | Join-Calculus JCC Compiled Interface |
Data Files
| 1 | 1 |
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