| Abbreviation | Definition |
|---|---|
| WIZ | Page WIZard |
| WIZ | Windows Information Zip file |
| WK1 | Spreadsheet (Lotus 123 version 2.x - Symphony 1.1+) |
| WK3 | Spreadsheet (Lotus 123 version 3.x) |
| WK4 | Lotus 1-2-3 version 3.4 Spreadsheet |
| WKB | WordPerfect for Win Workbook Document |
| WKE | Lotus 123 educational version Spreadsheet |
| WKI | Lotus 123 2.x Spreadsheet format |
| WKQ | Quattro Pro Workbook Spreadsheet |
| WKS | Lotus 123, Symphony 1.0 Spreadsheet |
| WKS | Microsoft Works Document |
| WKS | Xlisp Workspace |
| WKZ | Wingz Workbook Spreadsheet |
| WL1 | Shareware Version of Wolfenstein 3D file |
| WL2 | Well Logger v2.x file |
| WL6 | Registered Version of Wolfenstein 3D file |
| WLF | Argo WebLoad Upload file |
| WLF | Wave Log Format |
| WLG | Dr. Watson Log |
| WLK | Virtus Walkthrough Graphics |