X (38 file types)
File extensions that start with the letter X

Extension	Name of file type	Ranking
.x	DirectX Model File
.x32	Adobe Xtra File
.xaml	XAML File
.xap	Silverlight Application Package File
.xbel	Bookmark Exchange Language File
.xcf	Gimp XCF Bitmap Image File
.xdw	Docuworks Document File
.xfd	Extensible Forms Description Language Template File
.xfdl	XFDL File
.xhtml	Extensible HTML File
.xif	ScanSoft Pagis File
.xlb	Excel Toolbars File
.xlk	Microsoft Excel Backup File
.xlr	Microsoft Works Spreadsheet Or Chart File
.xls	Excel Spreadsheet File
.xlsm	Excel Open XML Macro-Enabled Spreadsheet File
.xlsx	Microsoft Excel Open XML Spreadsheet File
.xlt	Excel Template File
.xmi	XML Metadata Interchange Format
.xml	XML Document File
.xmp	Extensible Metadata Platform File
.xnk	Microsoft Exchange Shortcut File
.xpi	Mozilla Installer Package File
.xpl	X-plane Plug-in File
.xpr	Pro/ENGINEER Part Instance Accelerator File
.xps	XML Paper Specification File
.xpt	Mozilla Firefox Component File
.xsd	XML Schema Description File
.xsf	InfoPath Form Definition File
.xsl	XML Stylesheet File
.xslt	Xsl Transform File
.xspf	XML Shareable Playlist Format
.xul	Firefox XML User Interface Language File
.xvid	Xvid-Encoded Video File
.xwd	X Window Window Screen Dump Or Bitmap File
.xxx	Compucon/singer Psw Embroidery Design File
.xyz	Molecule Specification File
.xz	Xz Utils Compressed Archive File

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