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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .JDF | Adobe Systems Incorporated | Settings Files | Adobe Acrobat Job Definition File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .JEQ | Cowon Systems | Settings Files | JetAudio Equalizer Settings | jetAudio | Cowon Systems |
| .JFF | Freedom Scientific | Settings Files | JAWS INI Data | JAWS | Freedom Scientific |
| .JGP | Jolly Giant Inc | Settings Files | QWS3270 PLUS Session Parameter Data | QWS3270 PLUS | Jolly Giant Inc |
| .JMD | Corel | Settings Files | Corel PaintShop Pro Image Map Settings | PaintShop Pro | Corel |
| .JOBS | Open Source | Settings Files | VirtualDub Job File | VirtualDub | Open Source |
| .JPL | Sonic Foundry | Settings Files | Siren Jukebox File | Siren Jukebox | Sonic Foundry |
| .JSD | Jazer Solutions | Settings Files | Jazer Data File | Jazer | Jazer Solutions |
| .JSF | Adobe Systems Incorporated | Settings Files | Java Script Command File | Adobe Fireworks | Adobe Systems Incorporated |
| .JSM | Mozilla | Settings Files | Firefox JavaScript Module | Mozilla Firefox | Mozilla |
| .JSR | HASP Online, LLC | Settings Files | Job Safety Report Definition File | JSA Generator | HASP Online, LLC |
| .JUDO | Sublime HQ Pty Ltd | Settings Files | JudoScript Source Code | Sublime Text | Sublime HQ Pty Ltd |
| .JWS | Oracle Corporation | Settings Files | Java Web Services File | WebLogic | Oracle Corporation |
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