| .wgp |
Web Gallery Project |
| .wn |
WN Web File |
| .wbxml |
WAP Binary XML File |
| .wpx |
Printer Description File |
| .webarchivexml |
Android Web Browser Archive |
| .wbs |
WebBlender Project File |
| .xhtml |
Extensible Hypertext Markup Language File |
| .xfdl |
XFDL File |
| .xhtm |
Extensible Hypertext Markup Language Document |
| .xul |
XML User Interface Language File |
| .xpd |
PlayStation Store PSP License File |
| .xht |
XHTML File |
| .xbel |
XBEL Bookmarks File |
| .xws |
Xara Web Designer Graphic |
| .xbl |
Extensible Binding Language File |
| .xss |
XML Style Sheet |
| .zvz |
Possible Virus File |
| .zfo |
XSL-FO Online Form |
| .zhtml |
Secure IE Zipped HTML File |
| .zul |
ZK User Interface File |
| .wtp |
Web Tools Project File |