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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .XBEL | Python Software Foundation | Web Files | XBEL Bookmarks File | Arora | Open Source |
| .XBL | Open Source | Web Files | XBLite Source Code File | XBLite | Open Source |
| .XFDL | IBM | Web Files | Extensible Forms Description Language | Microsoft Notepad | Microsoft Corporation |
| .XHR | Microsoft Corporation | Web Files | XMLHttpRequest | Google Chrome | |
| .XHT | Open Source | Web Files | XHTML File | Google Chrome | |
| .XHTM | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Internet Explorer | Microsoft Corporation |
| .XHTML | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Internet Explorer | Microsoft Corporation |
| .XSS | Oracle Corporation | Web Files | XML Style Sheet | Microsoft Visual Studio | Microsoft Corporation |
| .XTML | Altairis | Web Files | XML4web Virtual HTML Document | XML4web | Altairis |
| .XUL | Mozilla | Web Files | XML User Interface Language File | Netscape Navigator | NetScape |
| .XWS | Magix Software GmbH | Web Files | Xara Web Designer Graphic | Xara Designer Pro X | Magix Software GmbH |
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