| Extension | File Description |
| .WINDOW | Uncommon Files |
| .WINDOWS | Uncommon Files |
| .WINDOWS9X | Uncommon Files |
| .WINDOWSLIV | Data Files |
| .WINGS | Uncommon Files |
| .WINI | Uncommon Files |
| .WINNERS | Uncommon Files |
| .WINS | Uncommon Files |
| .WINWARE | Uncommon Files |
| .WIO | Uncommon Files |
| .WIP | Uncommon Files |
| .WIPE | Uncommon Files |
| .WIPEINFO | Uncommon Files |
| .WIPESLACK | Uncommon Files |
| .WIQ | Uncommon Files |
| .WIR | Uncommon Files |
| .WIRE | Uncommon Files |
| .WIS | Uncommon Files |
| .WISHING | Uncommon Files |
| .WIT | Uncommon Files |
| .WITCH | Uncommon Files |
| .WITH | Uncommon Files |
| .WITHDRAWAL | Uncommon Files |
| .WITHDRAWAL | Uncommon Files |
| .WIU | Uncommon Files |
| .WIV | Uncommon Files |
| .WIW | Uncommon Files |
| .WIX | Uncommon Files |
| .WIXLIB | Uncommon Files |
| .WIXPROJ | Uncommon Files |
| .WIY | Uncommon Files |
| .WIZ | Executable Files |
| .WIZARD | Uncommon Files |
| .WJ | Uncommon Files |
| .WJ0 | Uncommon Files |
| .WJ1 | Uncommon Files |
| .WJ2 | Uncommon Files |
| .WJ3 | Uncommon Files |
| .WJ4 | Uncommon Files |
| .WJ5 | Uncommon Files |
| .WJ6 | Uncommon Files |
| .WJ7 | Uncommon Files |
| .WJ8 | Uncommon Files |
| .WJ9 | Uncommon Files |
| .WJA | Uncommon Files |
| .WJB | Uncommon Files |
| .WJC | Uncommon Files |
| .WJD | Uncommon Files |
| .WJE | Uncommon Files |
| .WJF | Misc Files |
| .WJG | Uncommon Files |
| .WJH | Uncommon Files |
| .WJI | Uncommon Files |
| .WJJ | Uncommon Files |
| .WJK | Uncommon Files |
| .WJL | Uncommon Files |
| .WJM | Uncommon Files |
| .WJN | Uncommon Files |
| .WJO | Uncommon Files |
| .WJP | Uncommon Files |
| .WJQ | Uncommon Files |
| .WJR | Data Files |
| .WJS | Uncommon Files |
| .WJT | Uncommon Files |
| .WJU | Uncommon Files |
| .WJV | Uncommon Files |
| .WJW | Uncommon Files |
| .WJX | Uncommon Files |
| .WJY | Uncommon Files |
| .WJZ | Uncommon Files |
| .WK | Spreadsheet Files |
| .WK! | Uncommon Files |
| .WK0 | Uncommon Files |
| .WK1 | Data Files |
| .WK2 | Uncommon Files |
| Extension | File Description |
| .WK3 | Data Files |
| .WK4 | Data Files |
| .WK5 | Uncommon Files |
| .WK6 | Uncommon Files |
| .WK7 | Uncommon Files |
| .WK8 | Uncommon Files |
| .WK9 | Uncommon Files |
| .WKA | Uncommon Files |
| .WKB | Uncommon Files |
| .WKC | Uncommon Files |
| .WKD | Uncommon Files |
| .WKE | Data Files |
| .WKEY | Uncommon Files |
| .WKF | Uncommon Files |
| .WKG | Uncommon Files |
| .WKH | Uncommon Files |
| .WKI | Uncommon Files |
| .WKJ | Uncommon Files |
| .WKK | Uncommon Files |
| .WKL | Uncommon Files |
| .WKM | Uncommon Files |
| .WKN | Uncommon Files |
| .WKO | Uncommon Files |
| .WKP | Uncommon Files |
| .WKQ | Uncommon Files |
| .WKR | Uncommon Files |
| .WKS | Spreadsheet Files |
| .WKSH | Uncommon Files |
| .WKSHX | Uncommon Files |
| .WKSP | Uncommon Files |
| .WKT | Uncommon Files |
| .WKU | Uncommon Files |
| .WKV | Uncommon Files |
| .WKW | Uncommon Files |
| .WKX | Uncommon Files |
| .WKY | Uncommon Files |
| .WKZ | Uncommon Files |
| .WL | Uncommon Files |
| .WL0 | Uncommon Files |
| .WL1 | Uncommon Files |
| .WL2 | Uncommon Files |
| .WL3 | Uncommon Files |
| .WL4 | Uncommon Files |
| .WL5 | Uncommon Files |
| .WL6 | Game Files |
| .WL7 | Uncommon Files |
| .WL8 | Uncommon Files |
| .WL9 | Uncommon Files |
| .WLA | Uncommon Files |
| .WLB | Uncommon Files |
| .WLC | Uncommon Files |
| .WLD | Game Files |
| .WLE | Uncommon Files |
| .WLF | Uncommon Files |
| .WLG | Uncommon Files |
| .WLH | Uncommon Files |
| .WLI | Uncommon Files |
| .WLJ | Uncommon Files |
| .WLK | Uncommon Files |
| .WLL | Uncommon Files |
| .WLM | Uncommon Files |
| .WLMP | Video Files |
| .WLN | Uncommon Files |
| .WLO | Uncommon Files |
| .WLP | Page Layout Files |
| .WLQ | Uncommon Files |
| .WLR | Uncommon Files |
| .WLS | Uncommon Files |
| .WLT | Uncommon Files |
| .WLU | Uncommon Files |
| .WLV | Uncommon Files |
| .WLW | Uncommon Files |
| .WLX | Misc Files |
| .WLY | Uncommon Files |
| .WLZ | Plugin Files |
