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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .J | Oracle Corporation | Compressed Files | Java Source File | Vim | Bram Moolenaar |
| .JA | Trainz portal | Compressed Files | Jet Archive | N3V Games Trainz Simulator | Trainz portal |
| .JAR | Oracle Corporation | Compressed Files | Java Archive File | 7-Zip | Igor Pavlov |
| .JIGDO | Richard Atterer | Compressed Files | Jigsaw Download Instruction File | Jigdo | Richard Atterer |
| .JP4 | Open Source | Compressed Files | Elphel Project Data | Elphel Project | Open Source |
| .JPQ | Open Source | Compressed Files | JPQ (Jared Package) Library Archive | JPQ (Jared Package) Library | Open Source |
| .JSO | Sony | Compressed Files | PSP ISO Compressor | JISO | isocompressor.com |
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