.J | Oracle Corporation | Udviklerfiler | Java Source File | Internet Explorer | Microsoft Corporation |
.JAV | Oracle Corporation | Udviklerfiler | Java Source Code | Microsoft Notepad | Microsoft Corporation |
.JAVA | Oracle Corporation | Udviklerfiler | Java Source Code | Microsoft Notepad | Microsoft Corporation |
.JCK | Microsoft Corporation | Datafiler | Microsoft Liquid Motion JACK Scene Escription | Liquid Motion | Microsoft Corporation |
.JET | Microsoft Corporation | Databasefiler | JET Database File | Microsoft Access | Microsoft Corporation |
.JFI | Joint Photographic Experts Group | Rasterbilledfiler | JPEG File Interchange Image | Windows Photo Gallery | Microsoft Corporation |
.JFIF | Unknown Developer | Rasterbilledfiler | JPEG File Interchange Format | Internet Explorer | Microsoft Corporation |
.JFW | ESRI | GIS-filer | JPEG World File | Microsoft Notepad | Microsoft Corporation |
.JGW | ESRI | GIS-filer | JPEG World File | Microsoft Notepad | Microsoft Corporation |
.JHTML | Oracle Corporation | Webfiler | Java HTML Web Page | Internet Explorer | Microsoft Corporation |
.JIF | Joint Photographic Experts Group | Rasterbilledfiler | JPEG Image | Microsoft Windows Photos | Microsoft Corporation |
.JLB | Microsoft Corporation | Systemfiler | PAC Mate BX Keyboard Driver | Windows Mobile | Microsoft Corporation |
.JMH | Unknown Developer | Rasterbilledfiler | JPEG File Interchange Format | Internet Explorer | Microsoft Corporation |
.JNLP | Oracle Corporation | Webfiler | Java Web Start File | Microsoft Notepad | Microsoft Corporation |
.JNT | Microsoft Corporation | Datafiler | Windows Journal File | Microsoft Windows Journal | Microsoft Corporation |
.JOB | Metamation | CAD-filer | MetaCAM Nest Job File | Windows Task Scheduler | Microsoft Corporation |
.JOR | Microsoft Corporation | Ikke Almindelige Filer | Microsoft SQL Server Journal File | Microsoft SQL Server | Microsoft Corporation |
.JP2 | Joint Photographic Experts Group | Rasterbilledfiler | JPEG 2000 Core Image File | ACD Systems Canvas | Microsoft Corporation |
.JPEG | Joint Photographic Experts Group | Rasterbilledfiler | JPEG Image | Microsoft Windows Photos | Microsoft Corporation |
.JPG | Joint Photographic Experts Group | Rasterbilledfiler | JPEG Image | Microsoft Windows Photos | Microsoft Corporation |
.JPG-LARGE | Zoner Software | Rasterbilledfiler | Large JPEG Image | Internet Explorer | Microsoft Corporation |
.JPN | Microsoft Corporation | Systemfiler | Windows Japanese Noise-Word List File | Microsoft Notepad | Microsoft Corporation |
.JPR | Microsoft Corporation | Tekstfiler | WordPad Document | Microsoft WordPad | Microsoft Corporation |
.JQX | Microsoft Corporation | Datafiler | Microsoft Windows Help-Related File | Microsoft Windows | Microsoft Corporation |
.JRS | Microsoft Corporation | Sikkerhedskopifiler | Extensible Storage Engine (ESE) Reserve Transaction Log | Microsoft Exchange Server | Microsoft Corporation |
.JS | NetScape | Webfiler | JavaScript File | Microsoft Edge | Microsoft Corporation |
.JSCRIPT | NetScape | Webfiler | JavaScript File | Microsoft Edge | Microsoft Corporation |
.JSE | Microsoft Corporation | Eksekverbare filer | JScript Encoded File | Microsoft Visual Studio | Microsoft Corporation |
.JSON | Mozilla | Sikkerhedskopifiler | Mozilla Firefox Bookmarks Backup | Microsoft Notepad | Microsoft Corporation |
.JSONLD | Microsoft Corporation | Datafiler | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
.JSP | Oracle Corporation | Webfiler | Java Server Page | Microsoft Edge | Microsoft Corporation |
.JSPA | Xinox Software | Webfiler | Java Servlet Alias | Internet Explorer | Microsoft Corporation |
.JSPF | Oracle Corporation | Udviklerfiler | Java Server Page Fragment | Microsoft Notepad | Microsoft Corporation |
.JSPROJ | Microsoft Corporation | Datafiler | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
.JTF | Various Developers | Rasterbilledfiler | JPEG Tagged Interchange Format | Microsoft Windows Photos | Microsoft Corporation |
.JTP | Microsoft Corporation | Sideopsætningsfiler | Windows Journal Template | Microsoft Windows Journal | Microsoft Corporation |
.JTX | Microsoft Corporation | Sideopsætningsfiler | XPS Document File | Microsoft XPS Viewer | Microsoft Corporation |
.JVS | Opera Software | Webfiler | JavaScript Proxy Autoconfig File | Internet Explorer | Microsoft Corporation |
.JW | Microsoft Corporation | Datafiler | Microsoft WordPad Document | Microsoft WordPad | Microsoft Corporation |
.JWK | Douglas Crockford | Krypterede Filer | JSON Web Key | Microsoft Notepad | Microsoft Corporation |
.JWL | Roxio | Rasterbilledfiler | Roxio Jewel Case File | JustWrite Office | Microsoft Corporation |
.JXR | Microsoft Corporation | Rasterbilledfiler | JPEG XR Image | Microsoft Windows Photos | Microsoft Corporation |