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Abkürzung-Kategorie: x
| Abkürzung | Langform |
| X | Exchange, Execute, Extended |
| x#0 | Overlay-Dateien (XTree) |
| X11 | X Window System |
| XA | Extended Architecture/Attribute |
| XAA | XFree86 Acceleration Architecture |
| XAML | Extensible Application Markup Language |
| XAPIA | X.400-API Association |
| xbm | Internet Image (Autoload) |
| XBRL | Extensible Business Report Language |
| XCBP | XML Common Biometric Format |
| XCHG | Exchange |
| XCHS | Extended Cylinders, Heads, Sectors |
| XCMD | Extended Mode Command (Apple) |
| XCMD | External Command |
| XD | Execute Disable |
| XDCS | X/Open Distributed Computing Services |
| XDF | Extended Density Format (IBM) |
| XDLE | Transparent Data Link Escape |
| XDMCP | X11 Display Manager Control Protocol |
| XDP | XML Data Package |
| XDR | External/Extended Data Representation |
| XDS | X/Open Directory Service |
| XETB | Transparent End of Transmission Block |
| XETX | Transparent End of Text |
| XEWA | XML-Enabled Wide Area Search in Bioinformatics |
| XFA | Extended File Attribute |
| XFA | XML Forms Architecture |
| XFCD | eXtendend Floating Car Data |
| XFCN | External Function |
| XFDF | XML Forms Data Format |
| XFDL | Extensible Forms Description Language |
| XFN | X/Open Federated Naming Service |
| XFS | X11 Extended File System |
| XG | Extended General MIDI |
| XGA | Extended Graphics Array (IBM) |
| XHTML | Extensible Hypertext Markup Language |
| XID | Exchange Identifier/Identification |
| XIE | X11 Image/Imaging Extension (Standard) |
| XIE-DIS | XIE Document Imaging Subset |
| XIM | X11 Input Method |
| XIO | Extended Input Output |
| XITB | Transparent Intermediate Block |
| XKB | X11 Keyboard Extension |
| XLATE | Translate |
| xlb | MS Excel-Datei |
| xlc | Diagramm (Excel / Chart) |
| xld | Excel Dialog Datei |
| XLFD | X11 Logical Font Description/Descriptor |
| XLINK | Extended Local Informatik Netz Karlsruhe |
| xlk | Excel Sicherungsdatei |