| 81. | .wmls | Wireless Markup Language script (WAP) |
| 82. | .wmlsc | Wireless Markup Language bytecode script (WAP) |
| 83. | .wmp | Graphics (Windows Magic Icon Palette) |
| 84. | .wmv | Windows Media Video file |
| 85. | .wmz | Graphics (seems to contain both vector and bitmap images) (Microsoft Word 2000) ◊ Zipped skin file (Windows Media Player) |
| 86. | .wn | Text document (NeXT WriteNow) |
| 87. | .wnf | Outline font description (CorelDraw native format) |
| 88. | .woa | Swap file (Windows 3.x) |
| 89. | .wob | Object file (RIO Designer Pro) |
| 90. | .woc | Organization chart (Windows OrgChart) |
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