| 1 | W2D | Autodesk, Inc. | Autodesk Design (Drawing) Web Format 2D |
| 2 | W2V | N/A | Yamaha Motif Voices Format |
| 3 | W3D | Adobe Systems | Adobe Shockwave 3D Format |
| 4 | W3G | Blizzard Entertainment | Warcraft 3 Replay Format |
| 5 | W3I | Blizzard Entertainment, Inc. | Warcraft III Map Related |
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| 6 | W3M | Blizzard Entertainment | Warcraft 3 Map Format |
| 7 | W3S | N/A | Warcraft 3 sounds definition |
| 8 | W3U | Blizzard Entertainment, Inc. | Warcraft 3 Custom Units |
| 9 | W3V | Blizzard Entertainment, Inc. | Warcraft 3 Campaign Progress Record |
| 10 | W3Z | Blizzard Entertainment | Warcraft 3 Saved Game Format |
| 11 | W4A | N/A | Audio |
| 12 | W60 | Corel Corporation | Corel WordPerfect 6.0 Document |
| 13 | W61 | Corel Corporation | Corel WordPerfect 6.1 Document |
| 14 | W64 | Sony | Sony Wave64 Audio Format |
| 15 | W6BN | Microsoft Corporation | Microsoft Word 6 For Mac Document |
| 16 | W6W | Microsoft Corporation | Microsoft Word 6 Document |
| 17 | W7V | N/A | Yamaha Motif ES Voices Format |
| 18 | W8BN | Microsoft Corporation | Microsoft Word 98 For Mac Document |
| 19 | W8TN | Microsoft Corporation | Microsoft Word 98 For Mac Template |
| 20 | WAB | Microsoft | Windows Address Book |
| 21 | WAD | id Software | Doom WAD Format |
| 22 | WAI | Blizzard Entertainment, Inc. | Warcraft 3 AI Data |
| 23 | WAR | Oracle | Java Web Archive |
| 24 | WAV | Microsoft | WAVE Audio Format |
| 25 | WAVC | N/A | Special ACM audio data |
| 26 | WAVE | Microsoft & IBM | WAVE Sound Format |
| 27 | WAX | Microsoft | Windows Media Audio Redirect |
| 28 | WA~ | N/A | Microsoft Address Book |
| 29 | WB0 | Corel Corporation | Corel Quattro Pro Spreadsheet |
| 30 | WB1 | AG Interactive | Webshots Picture Format |
| 31 | WB2 | Corel | Corel Quattro Pro Format |
| 32 | WB3 | Corel | Corel Quattro Pro 7 And 8 Format |
| 33 | WB? | N/A | Corel Quattro Pro spreadsheet file |
| 34 | WBA | Stardock | WindowBlinds Compressed Skin |
| 35 | WBC | AG Interactive | Webshots Collection Format |
| 36 | WBCAT | Microsoft | Windows Backup Catalog Format |
| 37 | WBF | Microsoft Corporation | Microsoft Windows Batch |
| 38 | WBFS | Waninkoko | Wii Backup Format System Format |
| 39 | WBK | Microsoft | Word Document Backup |
| 40 | WBM | Webmin | Wireless Bitmap Image Format |
| 41 | WBMP | N/A | Wireless Bitmap Image Format |
| 42 | WBP | AG, Inc. | Webshots Image |
| 43 | WBVERIFY | Microsoft Corporation | Microsoft Windows Backup |
| 44 | WBZ | AG Interactive | Webshots Download Picture Format |
| 45 | WCAP | N/A | Weston CAPture video |
| 46 | WCD | Microsoft | Works Calendar Format |
| 47 | WCF | N/A | WebEx Saved Chat Session |
| 48 | WCH | Corel Corporation | Corel WordPerfect Macro Facility |
| 49 | WCINV-MS-P2P | Microsoft Corporation | Windows Meeting Space |
| 50 | WCP | Corel | WinDVD Creator Project Format |
| 51 | WDB | Microsoft | Microsoft Works Database |
| 52 | WDBN | Microsoft Corporation | Microsoft World For Mac Document |
| 53 | WDF | Workshare | Workshare Compare DeltaFile |
| 54 | WDP | Microsoft | Windows Media HD Photo |
| 55 | WDX9 | Microsoft Corporation | Microsoft Word For Mac Wizard |
| 56 | WEA | Autodesk | Ecotect Weather Format |
| 57 | WEB | MAGIX | Xara Web Document |
| 58 | WEBARCHIVE | Apple | Safari Web Archive |
| 59 | WEBBOOKMARK | Apple | Safari Web Bookmark Format |
| 60 | WEBINTENTS | N/A | Webintents |
| 61 | WEBLOC | Apple | Mac OS X Website Location |
| 62 | WEBM | Google | WebM Video Format |
| 63 | WEBP | Google | WebP Image |
| 64 | WEBSETTINGS | N/A | JEE2 Web Project Settings |
| 65 | WEEKLY | N/A | Week log |
| 66 | WEM | Audiokinetic | Wwise Encoded Media Format |
| 67 | WER | Microsoft | Windows Error Report |
| 68 | WFLOW | Apple, Inc. | Apple Mac OS X Automator Workflow |
| 69 | WFX | Symantec Corporation | WinFax |
| 70 | WGC | N/A | WGCheck log |
| 71 | WGPKG | N/A | WarGaming update package |
| 72 | WHB | WindSolutions | Apple IPod Backup Image |
| 73 | WHD | Eidos Interactive Ltd. | Hitman Game Archive |
| 74 | WHM | Relic Entertainment Inc. | Warhammer 40,000: Dawn Of War Model |
| 75 | WI | N/A | Wavelet Image |
| 76 | WIA | N/A | Nintendo Wii ISO Archive |
| 77 | WIDGET | Yahoo! | Yahoo! Widget |
| 78 | WII | N/A | Scrambled Wii Disc Image |
| 79 | WIKI | N/A | Wiki Markup Source |
| 80 | WIM | Microsoft | Windows Imaging Format |
| 81 | WIN32MANIFEST | Microsoft Corporation | Microsoft Win32 Manifest |
| 82 | WIX | Xara Group Limited. | Xara Internal Graphics Data |
| 83 | WIZ | Microsoft | Microsoft Wizard Format |
| 84 | WK! | IBM | Lotus 1-2-3 Spreadsheet |
| 85 | WK1 | IBM | Lotus Worksheet |
| 86 | WK2 | IBM | Lotus 2 Worksheet |
| 87 | WK3 | IBM | Lotus 3 Worksheet |
| 88 | WK4 | IBM | Lotus 4 Worksheet |
| 89 | WK5 | IBM | Lotus 5 Worksheet |
| 90 | WKB | Corel Corporation | Corel WordPerfect Document |
| 91 | WKE | IBM | Lotus 1-2-3 Educational Version Worksheet |
| 92 | WKI | IBM | Lotus 2 Worksheet |
| 93 | WKQ | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| 94 | WKS | Microsoft | Works Spreadsheet |
| 95 | WKU | IBM | Lotus 1-2-3 Spreadsheet |
| 96 | WLI | N/A | Generic |
| 97 | WLL | Microsoft | Microsoft Word Add-in |
| 98 | WLPGINSTALL | N/A | Possible Malware data |
| 99 | WLPK | N/A | Renault R-Link update package |
| 100 | WLS | Software602, Inc. | 602Tab Document |
| 101 | WM | Microsoft | Windows Media Format |
| 102 | WMA | Microsoft | Windows Media Audio Format |
| 103 | WMF | Microsoft | Windows Metafile |
| 104 | WMGA | Manga Reader | Web Manga Document |
| 105 | WMI | WorldMate Inc. | WorldMate Itinerary Data |
| 106 | WML | N/A | Wireless Markup Language Format |
| 107 | WMLC | N/A | Wireless Markup Language Bytecode Document (WAP) |
| 108 | WMLS | N/A | Wireless Markup Language Script Format (WAP) |
| 109 | WMLSC | N/A | Wireless Markup Language (WAP) Bytecode Script |
| 110 | WMMP | Microsoft | Windows Movie Maker Project Format |
| 111 | WMV | Microsoft | Windows Media Video Format |
| 112 | WMX | Microsoft | Windows Media Redirector Format |
| 113 | WNV | N/A | Grand Theft Auto IV NavMesh data |
| 114 | WOFF | WebFonts Working Group | Web Open Font Format |
| 115 | WOFF2 | WebFonts Working Group | Web Open Font Format 2.0 File |
| 116 | WOR | Pitney Bowes Software | MapInfo Workspace Format |
| 117 | WORK | Bibble Labs | Bibble Work Queue Format |
| 118 | WORKFLOW | Apple | Automator Workflow |
| 119 | WORKSPACE | Adobe | Adobe Applications Workspace Setting |
| 120 | WOTREPLAY | Wargaming | World Of Tanks Replay Format |
| 121 | WP | Corel | WordPerfect Document |
| 122 | WP4 | Corel | WordPerfect 4 Document |
| 123 | WP5 | Corel | WordPerfect 5 Document |
| 124 | WP6 | Corel | WordPerfect 6 Document |
| 125 | WP7 | Corel | WordPerfect 7 Document |
| 126 | WP? | N/A | Corel WordPerfect document |
| 127 | WPC | Microsoft | WordPad Converter Format |
| 128 | WPD | Corel | WordPerfect Document |
| 129 | WPF | Corel | WordPerfect Form |
| 130 | WPG | Corel | WordPerfect Graphic Format |
| 131 | WPG2 | Corel Corporation | Corel WordPerfect Image |
| 132 | WPK | Nero | Nero Wave Editor Format |
| 133 | WPL | Microsoft | Windows Media Player Playlist |
| 134 | WPM | Corel | WordPerfect Macro Format |
| 135 | WPP | Corel Corporation | Corel WordPerfect Color Palette Format |
| 136 | WPR | Apple, Inc. | Apple Logic Studio WaveBurner Plug-in Preset |
| 137 | WPS | Microsoft | Microsoft Works Word Processor Document |
| 138 | WPSS | N/A | IBM WebSphere Server settings |
| 139 | WPT | Corel | WordPerfect Template |
| 140 | WPW | Corel Corporation | Corel WordPerfect Document Format |
| 141 | WPX | Adobe | Adobe Printer Description For Postscript Printing Format |
| 142 | WQ! | Corel Corporation | Corel Quattro Pro Compressed Spreadsheet |
| 143 | WQ0 | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| 144 | WQ1 | Corel | Quattro Pro For DOS Spreadsheet Format |
| 145 | WQ2 | Corel | Quattro Pro For DOS Spreadsheet Format |
| 146 | WR1 | IBM | Lotus Symphony Spreadsheet |
| 147 | WRAPPER | The GNOME Project | Gnome Desktop |
| 148 | WRC | Bulat Ziganshin | FreeArc Archive |
| 149 | WRI | Microsoft | Windows Write Document |
| 150 | WRL | N/A | VRML World |
| 151 | WRP | Geomagic | Geomagic 3D Wrap Format |
| 152 | WRS | Corel Corporation | Corel WordPerfect Windows Printer Driver |
| 153 | WRTS | Wrts | Wrts File |
| 154 | WS | Microsoft | Windows Script |
| 155 | WSDD | Apache Software Foundation | Apache Axis Web Service Deployment Descriptor (WSDD) |
| 156 | WSDL | W3C | Web Services Description Language Format |
| 157 | WSF | Microsoft | Windows Script Format |
| 158 | WSH | Microsoft | Windows Script Host Settings |
| 159 | WSK | Ashampoo GmbH & Co. KG | Whisset Media Player Skin |
| 160 | WSP | Microsoft | SharePoint Solution Package |
| 161 | WSSX | N/A | Generic |
| 162 | WTL | Microsoft Corporation | Windows Test Log |
| 163 | WTV | Microsoft | Windows Recorded TV Show Format |
| 164 | WTX | N/A | Text Document |
| 165 | WUS | WUSSoft | WUTG Tagged Audio Format |
| 166 | WUSIKSND | Wusik | Wusik Station Multisampled Sound |
| 167 | WV | WavPack | WavPack Audio Format |
| 168 | WVC | WavPack | WavPack Correction Format |
| 169 | WVE | DivX, LLC | DivX Movie Conversion Component Format |
| 170 | WVP | Symantec | Symantec Virtual Package Editor Virtual Software Project Format |
| 171 | WVX | Microsoft | Windows Media Video Redirector |
| 172 | WWB | Corel Corporation | Corel WordPerfect Button Bar |
| 173 | WWK | Corel Corporation | Corel WordPerfect Keyboard Layout |
| 174 | WWL | Microsoft Corporation | Microsoft Word Add-in |
| 175 | WXL | Microsoft Corporation | WiX Localization |
| 176 | WZCLOUD | N/A | Generic |
| 177 | WZS | Microsoft Corporation | Microsoft Word Wizard |
| 178 | WZSUL | N/A | WinZip multi-user registration |
| 179 | WZTHEME | N/A | Generic |
