| 21. | .jfif | Bitmap graphics (JPEG File Interchange Format) |
| 22. | .jif | Bitmap graphics (JPEG File Interchange Format) |
| 23. | .jis | Japanese Industry Standard (text) |
| 24. | .jmh | Bitmap graphics (JPEG File Interchange Format) |
| 25. | .jmp | Discovery chart-to-statistics (SAS JMP) |
| 26. | .jms | Graphical representation of Interactive Voice Response call flow (Voxtron TeleButler) ◊ Music format (JMusic file) (UltraForce) |
| 27. | .jn1 | Game data (Epic MegaGames Jill of the Jungle) |
| 28. | .jnb | Jandel SigmaPlot graphics notebook page ◊ Workbook file (Sigma Plot 5) |
| 29. | .job | Job object (Scheduler) ◊ Vector graphics (QuestVision) |
| 30. | .joi | Join conferences file (XBoard) |
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