| wft | Oracle Workflow Process Definition |
| wft | Nicolet DSO Exported Data |
| wfu | Molpro Permanent Wave-function Data |
| wfv | DataSet Vision Query Report |
| wfx | AIM Extended Wavefunction 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 |
| wh2 | Clear Creek Solutions Project Data |
| whf | Wing Helper Design Document |
| whp | FullProf Williamson-Hall Plot Data |
| whr | SAP R/3 Tablesplitting Query Data |
| whtt | HTTrack Website Copier Data |
| whx | WinHex Backup 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 |
| wings | Wings 3D Mesh |
| winmerge | WinMerge Data |
| wir | Mentor Expedition PCB Tool Data |
| wis | InstallShield Help Data |
| witsml | Wellsite Information Transfer Standard Markup Language Data |
| wizard | StormWIZARD Resource Data |
| wjf | WinZip Job File |
| wjr | ReGet Junior Data |
| wkd | WiKID Token Data |
| wkf | VISI CAD Work Data |