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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .509 | Microsoft Corporation | Web Files | Internet Security Certificate | Apple Safari | Apple |
| .AP | Fifth Generation Systems | Web Files | Active Page | Apple Safari | Apple |
| .ATOM | YKOON BV | Web Files | Atom Syndication Format | Apple Safari | Apple |
| .BOK | Pearson | Data Files | TestGen Testbank File | Apple Safari | Apple |
| .CER | Microsoft Corporation | Web Files | Internet Security Certificate | Apple Safari | Apple |
| .CHM | Microsoft Corporation | Web Files | Compiled HTML Help File | Apple Safari | Apple |
| .CPC | Cartesian Products, Inc. | Raster Image Files | CPC Compressed Image File | Apple Safari | Apple |
| .CRT | Mozilla | Web Files | Security Certificate | Apple Safari | Apple |
| .DBM | Adobe Systems Incorporated | Web Files | ColdFusion Server File | Apple Safari | Apple |
| .DEL | Apple | Data Files | Apple Safari | Apple Safari | Apple |
| .DER | Mozilla | Web Files | DER Certificate File | Apple Safari | Apple |
| .DML | Sybase, Inc | Web Files | DynaScript File | Apple Safari | Apple |
| .GIF | The GIMP Development Team | Raster Image Files | Graphical Interchange Format File | Apple Safari | Apple |
| .GNE | Ludicorp | Web Files | Flickr Web Page | Apple Safari | Apple |
| .HT | Hilgraeve Inc | Settings Files | HyperTerminal Session File | Apple Safari | Apple |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Apple Safari | Apple |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Apple Safari | Apple |
| .IWS | JetBrains | Developer Files | IntelliJ IDEA Web Page | Apple Safari | Apple |
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple Safari | Apple |
| .JAR | Oracle Corporation | Compressed Files | Java Archive File | Apple Safari | 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 |
| .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 Safari | 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 Safari | Apple |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | Apple Safari | Apple |
| .JS | NetScape | Web Files | JavaScript File | Apple Safari | Apple |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Apple Safari | Apple |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Apple Safari | Apple |
| .LOCALSTORAGE | Data Files | WebKit Local Storage Data File | Apple Safari | Apple | |
| .ODC | Microsoft Corporation | Settings Files | Office Data Connection File | Apple Safari | Apple |
| .PAC | NetScape | Web Files | Proxy Auto-Config File | Apple Safari | Apple |
| .PHP5 | Open Source | Web Files | PHP 5 Web Page | Apple Safari | Apple |
| .PJP | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .PLUGIN | Adobe Systems Incorporated | Plugin Files | Adobe Photoshop Plugin | Apple Safari | Apple |
| .PNG | The Pixelmator Team | Raster Image Files | Portable Network Graphics | Apple Safari | Apple |
| .RHTML | Yukihiro “Matz” Matsumoto | Web Files | Ruby HTML Web Page | Apple Safari | Apple |
| .RMT | The Catalina Group | System Files | Router Firmware File | Apple Safari | Apple |
| .SHT | The Document Foundation | Web Files | HTML File With Server Side Includes | Apple Safari | Apple |
| .SHTM | Opera Software | Video Files | HTML Server Side Include File | Apple Safari | Apple |
| .SK | Apple | Uncommon Files | Safari History Index File | Apple Safari | Apple |
| .TMP | Mozilla | Backup Files | General Temporary File | Apple Safari | Apple |
| .URL | Microsoft Corporation | Web Files | Internet Shortcut | Apple Safari | Apple |
| .VBD | Microsoft Corporation | Web Files | Visual Basic ActiveX Document | Apple Safari | Apple |
| .WEBARCHIVE | Apple | Web Files | Safari Web Archive | Apple Safari | Apple |
| .WEBLOC | Apple | Web Files | Mac OS X Website Location | Apple Safari | Apple |
| .WOA | Apple | Web Files | WebObjects Application | Apple Safari | Apple |
| .X-PNG | The Pixelmator Team | Raster Image Files | Portable Network Graphics | Apple Safari | Apple |
| .XBL | Open Source | Developer Files | XBLite Source Code File | Apple Safari | Apple |
| .XHTM | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Apple Safari | Apple |
| .XHTML | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Apple Safari | Apple |
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