| 11. | .jbd | Datafile (SigmaScan) |
| 12. | .jbf | Image browser file (Jasc Browser File) (Paint Shop Pro) |
| 13. | .jbg | Joint Bi-level Image experts Group file interchange format (1-bit raster image graphics) |
| 14. | .jbig | Joint Bi-level Image experts Group file interchange format (1-bit raster image graphics) |
| 15. | .jbx | Project file (Project Scheduler 4) |
| 16. | .jcm | Java commerce message |
| 17. | .jdx | JCAMP Spectroscopic Data Exchange Format |
| 18. | .jet | Fax (Hybrid JetFax) |
| 19. | .jff | Bitmap graphics (JPEG File Interchange Format) |
| 20. | .jfi | Bitmap graphics (JPEG File Interchange Format) |
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