| 61. | .wk3 | Spreadsheet (Lotus 1-2-3 version 3.x) |
| 62. | .wk4 | Spreadsheet (Lotus 1-2-3 version 3.4) |
| 63. | .wkb | Document (WordPerfect) |
| 64. | .wke | Spreadsheet (Lotus 1-2-3 educational version) |
| 65. | .wki | Spreadsheet format (Lotus 1-2-3 2.x) |
| 66. | .wkq | Spreadsheet (QuattroPro) |
| 67. | .wks | Document (Microsoft Works) ◊ Spreadsheet (Lotus 1-2-3 version 1A - Symphony 1.0 - Microsoft Works) ◊ Workspace (Xlisp) |
| 68. | .wkz | Spreadsheet (Wingz) |
| 69. | .wld | world file for CAD datasets (ArcView) |
| 70. | .wlf | Upload file (Argo WebLoad I) |
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