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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .J | Oracle Corporation | Developer Files | Java Source File | Safari | Apple |
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JAR | Oracle Corporation | Compressed Files | Java Archive File | Apple Safari | Apple |
| .JAV | Oracle Corporation | Developer Files | Java Source Code | Apple TextEdit | Apple |
| .JAVA | Oracle Corporation | Developer Files | Java Source Code | Apple TextEdit | Apple |
| .JFI | Joint Photographic Experts Group | Raster Image Files | JPEG File Interchange Image | Apple Photos | Apple |
| .JFIF | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Apple Safari | Apple |
| .JIF | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .JMH | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Apple Safari | Apple |
| .JNLP | Oracle Corporation | Web Files | Java Web Start File | Apple Pages | Apple |
| .JP2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Core Image File | Apple Safari | Apple |
| .JPEG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .JPG2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | Apple QuickTime Player | Apple |
| .JS | NetScape | Web Files | JavaScript File | Apple TextEdit | Apple |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Apple TextEdit | Apple |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Apple TextEdit | Apple |
| .JSP | Oracle Corporation | Web Files | Java Server Page | Safari | Apple |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Apple Safari | Apple |
| .JTF | Various Developers | Raster Image Files | JPEG Tagged Interchange Format | Apple Preview | Apple |
| .JWK | Douglas Crockford | Encrypted Files | JSON Web Key | Apple TextEdit | Apple |
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