| .xdr |
XML-Data Reduced File |
| .xsx |
Visual Studio XML Schema Layout File |
| .xadd |
Expression Web Add-in |
| .xmv |
Xbox Media Video File |
| .xbf |
XAML Binary File |
| .xlshtml |
Microsoft Excel HTML Spreadsheet |
| .xlsmhtml |
Microsoft Excel MIME HTML Spreadsheet |
| .xlthtml |
Microsoft Excel HTML Spreadsheet Template |
| .xld |
Excel Database File |
| .ybk |
Microsoft Encarta Yearbook File |
| .zap |
Zero Administration Package File |
| .zfsendtotarget |
Compressed Folder |
| .ztd |
Zoo Tycoon Data Archive |
| .z2f |
Zoo Tycoon 2 Object File |
| .zpl |
Zoom Player Play List |
| .zone.identifier |
Windows Zone Identifier File |
| .zoo |
Zoo Compressed File |
| .z2s |
Zoo Tycoon 2 Saved Game |
| .dfxp |
Timed Text Markup Language distribution format exchange profile |
| .dtcp-ip |
Microsoft Windows Movie Maker video |
| .lsf |
Advanced Streaming Format |
| .ivm |
Interactive Visual Media video format |
| .wmv3 |
Video data |
| .lsx |
Advanced Streaming Redirector |