.X | Microsoft Corporation | 3D Image Files | DirectX Model File | Microsoft DirectX SDK | Microsoft Corporation |
.X-PNG | The Pixelmator Team | Raster Image Files | Portable Network Graphics | Microsoft Windows Photos | Microsoft Corporation |
.X3D | Microsoft Corporation | 3D Image Files | Compiled Vertex Shader File | Microsoft DirectX SDK | Microsoft Corporation |
.XAML | Microsoft Corporation | Developer Files | Extensible Application Markup Language | Microsoft Notepad | Microsoft Corporation |
.XAMLX | Microsoft Corporation | Text Files | Microsoft Visual Studio XAMLX Document | Microsoft Visual Studio | Microsoft Corporation |
.XAP | Microsoft Corporation | Developer Files | XACT Project | Microsoft XACT | Microsoft Corporation |
.XAR | Magix Software GmbH | Vector Image Files | Xara Xtreme Drawing | Microsoft Excel | Microsoft Corporation |
.XBAP | Microsoft Corporation | Executable Files | XAML Browser Application File | Microsoft Visual Studio | Microsoft Corporation |
.XBF | Microsoft Corporation | Developer Files | XAML Binary File | Microsoft Visual Studio | Microsoft Corporation |
.XBX | Microsoft Corporation | Raster Image Files | Xbox Icon Or Picture | Microsoft XBOX | Microsoft Corporation |
.XCEL | Microsoft Corporation | Spreadsheet Files | Microsoft Excel For Mac Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XCP | Advanced Systems Concepts, Inc. | Text Files | XLNT Script Command | Microsoft XBOX | Microsoft Corporation |
.XDR | Microsoft Corporation | Settings Files | XML-Data Reduced File | Microsoft Notepad | Microsoft Corporation |
.XEE | Microsoft Corporation | Settings Files | Microsoft Expression Encoder Preset | Expression Encoder | Microsoft Corporation |
.XEJ | Microsoft Corporation | Video Files | Expression Encoder Job File | Microsoft Expression Studio | Microsoft Corporation |
.XEL | Microsoft Corporation | Video Files | Expression Encoder Live Encoding File | Microsoft Expression Studio | Microsoft Corporation |
.XESC | Microsoft Corporation | Graphic Files | Microsoft Expression Encoder Screen Capture Data | Microsoft Windows Media Player | Microsoft Corporation |
.XEX | Microsoft Corporation | Game Files | Xbox 360 Executable File | Microsoft XBOX | Microsoft Corporation |
.XFDL | IBM | Web Files | Extensible Forms Description Language | Microsoft Notepad | Microsoft Corporation |
.XGS | Microsoft Corporation | Settings Files | XACT Global Settings File | Microsoft XACT | Microsoft Corporation |
.XHT | Open Source | Web Files | XHTML File | Microsoft Edge | Microsoft Corporation |
.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 |
.XIP | Apple | Compressed Files | MacOS Signed Archive | Microsoft XBOX | Microsoft Corporation |
.XIX | Microsoft Corporation | Data Files | IIS NNTP Subject Lists | Microsoft Internet Information Services (IIS) | Microsoft Corporation |
.XL | Microsoft Corporation | Spreadsheet Files | Excel Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLA | Microsoft Corporation | Plugin Files | Excel Add-In File | Microsoft Excel | Microsoft Corporation |
.XLAM | Microsoft Corporation | Plugin Files | Excel Open XML Macro-Enabled Add-In | Microsoft Excel | Microsoft Corporation |
.XLB | Microsoft Corporation | Settings Files | Excel Toolbars File | Microsoft Excel | Microsoft Corporation |
.XLC | Microsoft Corporation | Data Files | Excel Chart | Microsoft Excel | Microsoft Corporation |
.XLD | Microsoft Corporation | Database Files | Excel Database File | Microsoft Excel | Microsoft Corporation |
.XLK | Microsoft Corporation | Backup Files | Excel Backup File | Microsoft Excel | Microsoft Corporation |
.XLL | Microsoft Corporation | Plugin Files | Excel Add-In File | Microsoft Excel | Microsoft Corporation |
.XLM | Microsoft Corporation | Executable Files | Excel Macro | Microsoft Excel | Microsoft Corporation |
.XLR | Microsoft Corporation | Spreadsheet Files | Microsoft Works Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLS | Microsoft Corporation | Spreadsheet Files | Microsoft Excel 97 To 2003 Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLSB | Microsoft Corporation | Spreadsheet Files | Excel Binary Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLSHTML | Microsoft Corporation | Spreadsheet Files | Microsoft Excel HTML Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLSM | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Open XML Macro-Enabled Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLSMHTML | Microsoft Corporation | Spreadsheet Files | Microsoft Excel MIME HTML Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLSX | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Open XML Spreadsheet | Microsoft Excel | Microsoft Corporation |
.XLT | Microsoft Corporation | Data Files | Excel Template File | Microsoft Excel | Microsoft Corporation |
.XLTHTML | Microsoft Corporation | Spreadsheet Files | Microsoft Excel HTML Spreadsheet Template | Microsoft Excel | Microsoft Corporation |
.XLTM | Microsoft Corporation | Spreadsheet Files | Excel Open XML Macro-Enabled Spreadsheet Template | Microsoft Excel | Microsoft Corporation |
.XLTX | Microsoft Corporation | Spreadsheet Files | Excel Open XML Spreadsheet Template | Microsoft Excel | Microsoft Corporation |
.XLV | Microsoft Corporation | Spreadsheet Files | Excel Visual Basic Module File | Microsoft Excel | Microsoft Corporation |
.XLW | Microsoft Corporation | Data Files | Microsoft Excel Workspace | Microsoft Excel | Microsoft Corporation |
.XML | Wattle Software | Data Files | XML File | Microsoft Word | Microsoft Corporation |
.XMP | Adobe Systems Incorporated | Uncommon Files | Extensible Metadata Platform File | Microsoft Notepad | Microsoft Corporation |
.XMS | Alexander Gross | Settings Files | Music Studio Project | MS-DOS | Microsoft Corporation |
.XNB | Microsoft Corporation | Game Files | XNA Game Studio Binary Package | Microsoft XNA Game Studio | Microsoft Corporation |
.XNK | Microsoft Corporation | Uncommon Files | Microsoft Exchange Public Folder Shortcut | Microsoft Exchange Server | Microsoft Corporation |
.XOML | Microsoft Corporation | Text Files | Microsoft Visual Studio XOML File | Microsoft Visual Studio | Microsoft Corporation |
.XPM | XnSoft | Raster Image Files | X11 Pixmap Graphic | ACD Systems Canvas | Microsoft Corporation |
.XPO | Microsoft Corporation | Data Files | Microsoft Dynamics AX Export File | Microsoft Dynamics AX | Microsoft Corporation |
.XPP | Microsoft Corporation | Developer Files | X++ Source Code File | Microsoft Dynamics AX | Microsoft Corporation |
.XPR | Parametric Technology Corporation | 3D Image Files | Pro/ENGINEER Part Instance Accelerator File | Microsoft Expression Studio | Microsoft Corporation |
.XPROJ | Microsoft Corporation | Text Files | Microsoft Visual Studio ASP.NET Project | Microsoft Visual Studio | Microsoft Corporation |
.XPS | Microsoft Corporation | Page Layout Files | Microsoft XPS (XML Paper Specification) File | Microsoft XPS Viewer | Microsoft Corporation |
.XQL | Open Source | Developer Files | XML Query Language File | Microsoft Notepad | Microsoft Corporation |
.XRM-MS | Microsoft Corporation | System Files | Microsoft Security Certificate | Microsoft Windows | Microsoft Corporation |
.XRX | Microsoft Corporation | Settings Files | Expression Encoder Media Profile Settings | Expression Encoder | Microsoft Corporation |
.XSB | Microsoft Corporation | Audio Files | XACT Sound Bank | Microsoft XACT | Microsoft Corporation |
.XSC | Microsoft Corporation | Data Files | Visual Studio Dataset Internal Info File | Microsoft Visual Studio | Microsoft Corporation |
.XSD | Unknown Developer | Developer Files | XML Schema Definition | Microsoft Visual Studio | Microsoft Corporation |
.XSF | Microsoft Corporation | Data Files | InfoPath Form Definition File | Microsoft InfoPath | Microsoft Corporation |
.XSL | Syncro Soft | Data Files | XML eXtensible Stylesheet | Microsoft Notepad | Microsoft Corporation |
.XSLT | Syncro Soft | Data Files | XSL Transformation File | Microsoft Notepad | Microsoft Corporation |
.XSN | Microsoft Corporation | Page Layout Files | InfoPath Form Template File | Microsoft InfoPath | Microsoft Corporation |
.XSS | Oracle Corporation | Web Files | XML Style Sheet | Microsoft Visual Studio | Microsoft Corporation |
.XTP | adnx | Data Files | xTime Project Document | Microsoft InfoPath | Microsoft Corporation |
.XTP2 | Microsoft Corporation | Data Files | Microsoft InfoPath Template | Microsoft InfoPath | Microsoft Corporation |
.XUI | Microsoft Corporation | Settings Files | Xbox 360 User Interface File | Microsoft Visual Studio | Microsoft Corporation |
.XVID | DivX, LLC. | Video Files | Xvid-Encoded Video File | Microsoft Windows Media Player | Microsoft Corporation |
.XWB | Microsoft Corporation | Audio Files | XACT Wave Bank | Microsoft XACT | Microsoft Corporation |
.XXT | Microsoft Corporation | System Files | Dynamic Link Library | Microsoft Visual FoxPro | Microsoft Corporation |