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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .JHTML | Oracle Corporation | Web Files | Java HTML Web Page | Internet Explorer | Microsoft Corporation |
| .JNLP | Oracle Corporation | Web Files | Java Web Start File | Apache OpenOffice | Apache Software Foundation |
| .JS | NetScape | Web Files | JavaScript File | Notepad++ | Don Ho |
| .JSB | Freedom Scientific | Web Files | JAWS Script Binary File | JAWS | Freedom Scientific |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Notepad++ | Don Ho |
| .JSF | Adobe Systems Incorporated | Web Files | Java Script Command File | Adobe Fireworks | Adobe Systems Incorporated |
| .JSON | Mozilla | Web Files | Mozilla Firefox Bookmarks Backup | Mozilla Firefox | Mozilla |
| .JSP | Oracle Corporation | Web Files | Java Server Page | Safari | Apple |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Internet Explorer | Microsoft Corporation |
| .JSS | SourceForge | Web Files | JavaScript Style Sheet File | JSS (Javascript Style Sheets) | SourceForge |
| .JST | Jabosoft | Web Files | Jnes Save State | Jnes | Jabosoft |
| .JVS | Opera Software | Web Files | JavaScript Proxy Autoconfig File | Internet Explorer | Microsoft Corporation |
| .JWS | Oracle Corporation | Web Files | Java Web Services File | WebLogic | Oracle Corporation |
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