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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .J | Oracle Corporation | Developer Files | Java Source File | gVim | Open Source |
| .J01 | Open Source | Backup Files | Akeeba Multi-part Backup Archive | Akeeba eXtract Wizard | Open Source |
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | IrfanView | Open Source |
| .JAS | Open Source | 3D Image Files | Cheetah3D Model File | Cheetah3D | Open Source |
| .JAV | Oracle Corporation | Developer Files | Java Source Code | gVim | Open Source |
| .JAVA | Oracle Corporation | Developer Files | Java Source Code | gVim | Open Source |
| .JBP | Open Source | Uncommon Files | Jabaco Project | Jabaco | Open Source |
| .JCC | Open Source | Data Files | Code Crusader Project Data | Code Crusader | Open Source |
| .JDBG | Open Source | Data Files | Embedded JCL Debug Information | Project JEDI | Open Source |
| .JGC | Open Source | Uncommon Files | JGCGen Script | JGCGen | Open Source |
| .JIF | Joint Photographic Experts Group | Raster Image Files | JPEG Image | IrfanView | Open Source |
| .JKS | Oracle Corporation | Encoded Files | Java Keystore File | KeyStore Explorer | Open Source |
| .JL | Julian Gabriel Casadesus and Others | Developer Files | Julia Source Code File | Julia | Open Source |
| .JOBS | Open Source | Settings Files | VirtualDub Job File | VirtualDub | Open Source |
| .JOINED | Freebyte | Data Files | HJ-Split Data File | HJ-Split | Open Source |
| .JP4 | Open Source | Compressed Files | Elphel Project Data | Elphel Project | Open Source |
| .JPA | Open Source | Backup Files | Akeeba Backup Archive | Akeeba eXtract Wizard | Open Source |
| .JPEG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | IrfanView | Open Source |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | IrfanView | Open Source |
| .JPG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | IrfanView | Open Source |
| .JPG-LARGE | Zoner Software | Raster Image Files | Large JPEG Image | IrfanView | Open Source |
| .JPG2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | IrfanView | Open Source |
| .JPM | Irfan Skiljan | Graphic Files | JPEG 2000 Multi-layer Image Format (ISO 15444-6) | IrfanView | Open Source |
| .JPQ | Open Source | Compressed Files | JPQ (Jared Package) Library Archive | JPQ (Jared Package) Library | Open Source |
| .JPS | Open Source | Backup Files | Akeeba Backup Archive | Akeeba eXtract Wizard | Open Source |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | IrfanView | Open Source |
| .JRC | Open Source | Game Files | PCjr Cartridge ROM File | DOSBox | Open Source |
| .JS | NetScape | Web Files | JavaScript File | JACOsub | Open Source |
| .JSE | Microsoft Corporation | Executable Files | JScript Encoded File | Notepad2 | Open Source |
| .JSF | Adobe Systems Incorporated | Web Files | Java Script Command File | Project64 | Open Source |
| .JSH | Freedom Scientific | Developer Files | JAWS Script Header File | Jsh | Open Source |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Pico | Open Source |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Amaya | Open Source |
| .JST | Jabosoft | Game Files | Jnes Save State | Code Crusader | Open Source |
| .JWW | Open Source | Data Files | Java Web-Workflows Data | Java Web-Workflows | Open Source |
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