X...

• XA Extended Architecture + Extended Attribute
• XAPIA X.400 Application Program Interface Association
• X2B Hexadecimal to Binary [REXX]
• .XBM X-Windows Bitmaps (file name extension) (black and white)
• .XPM X-Windows Pixelmaps (file name extension) (color)
• X2C Hexadecimal to Character [REXX]
• XCHG Exchange
• XCMD External Command
• XCOPY Extended Copy
• X2D Hexadecimal to Decimal [REXX]
• XDF Extended Density Format [IBM]
• XDR Extended/External Data Representation
• XFCN External Function
• XFDL Extensible forms Description Language
• XGA Extended Graphics Array [IBM]
• XHTML Extensible HyperText Markup Language
• XID Exchange Identifier
• XIOS Extended Input/Output System
• .XLA Add-In (file name extension) [Microsoft-Excel]
• XLAT Translate
• XLF Exceptional Fortran [IBM]
• .XLK Backup (file name extension) [Microsoft-Excel]
• XLL Extensible Link Language
• XLM Excel Macro Language [Microsoft]
• .XLT Template (file name extension) [Microsoft-Excel]
• XMIT Transmit
• XML Extensible Markup Language
• XMM Extended Memory Manager [LIM/AST]
• XMS Extended Memory Specification [LIM/AST]
• XNS Xerox Network System (protocol) [Xerox]
• XOFF Transmitter Off
• XON Transmitter On
• XOR Exclusive OR (Also EOR)
• XP Extreme Performance [Compaq]
• XPCOM Cross Platform Component Object Model [Mozilla]
• XPE XP Embedded (see WIN...XP) [Microsoft]
• XPRM Xerox Print Resources Manager [Xerox]
• XRNS Extensible Resource Name System
• XRT Extensions for Real-Time
• XSL Extensible Style Language
• XSLT Extensible Stylesheet Transformation
• XSMD Extended Storage Module Drive (interface)
• XSSI Extended Server Side Includes
• XTAL Crystal
• XTCLK External Transmit Clock
• XUL Extensible User-Interface Language [Netscape]