| wfu | Molpro Permanent Wave-function Data |
| wfv | DataSet Vision Query Report |
| wfx | AIM Extended Wavefunction Data |
| wgc | WGCheck Data |
| wgl | Waveform Generation Language Data |
| wgn | SWAT Weather Generator Input Data |
| wgq | WackGet Queue Data |
| wgs | RichFX Walk-Graph Segment |
| wgt | SPSD/M WGT Data |
| wgx | WatchGuard IPSec Mobile VPN Client Certificate Data |
| wh2 | Clear Creek Solutions Project Data |
| whf | Wing Helper Design Document |
| whlp | Microsoft Word for Mac Help Data |
| whp | FullProf Williamson-Hall Plot Data |
| whr | SAP R/3 Tablesplitting Query Data |
| whtt | HTTrack Website Copier Data |
| whx | WinHex Backup Data |
| wibucmrac | WIBU CodeMeter Remote Context Data |
| wibucmram | WIBU CodeMeter Modified Context Data |
| wibucmrau | WIBU CodeMeter Remote Update Data |
| wid | Corel Ventura 4 Width Table |
| wid | Microsoft Sharepoint Document Set Index |
| wie | WordPress Widget Exporter Data |
| wiff | AB SCIEX Windows Interchange File Format Data |
| wig | Wiggle Genome Track Data |
| wild | HyperCard WILD Data |
| wimp | Microsoft Windows Icon Palette |
| win | Opera Saved Session |
| win32 | GetDiz Data |
| windowslivecontact | Windows Live Messenger Contacts Data |