| .wal |
Winamp Modern Skin |
| .wsz |
Winamp Classic Skin |
| .wcm |
WordPerfect Macro |
| .wba |
WindowBlinds Compressed Skin |
| .wwd |
Works Wizard File |
| .wjf |
WinZip Job File |
| .w |
OpenEdge Architect Source Code File |
| .wordlist |
Desktop Poet Word List File |
| .wje |
WinJournal Entry |
| .wtc |
Logitech Webcam File |
| .wrts |
Wrts File |
| .wzmul |
WinZip Registration File |
| .wdseml |
Thunderbird Searchable Email File |
| .weavelibrary |
Painter Weave Library |
| .wgs |
Walk-Graph Segment File |
| .wul |
WinUHA Language File |
| .wcinv |
Windows Meeting Space Invitation File |
| .xol |
Swiss Map Overlay |
| .xnk |
Exchange Shortcut |
| .xlnk |
XML Shortcut File |
| .xwf |
OmniPage Workflow File |
| .xpr |
Pro/ENGINEER Part Instance Accelerator File |
| .xlw |
Excel Workbook |
| .xslic |
XenServer License File |