| 31. | .jor | Journal file (Gupta SQLWindows) |
| 32. | .jou | Journal file (VAX Edt editor) |
| 33. | .jpc | Bitmap graphics (Japan Picture format) |
| 34. | .jpe | Bitmap graphics (Joint Photographic Experts Group JFIF format) |
| 35. | .jpeg | Bitmap graphics (Joint Photographic Experts Group JFIF format) |
| 36. | .jpg | Bitmap graphics (Joint Photographic Experts Group JFIF format) |
| 37. | .jrc | Compressed file archive (JRchive) |
| 38. | .js | JavaScript language source code file (script) ◊ Script (JACOsub) |
| 39. | .jsd | Jet Suite document (eFAX) |
| 40. | .jse | Encoded script file (JScript) |
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