| .W14 | Genesis 2000, Inc | Arquivos de dados | Genesis 2000 Data | Genesis 2000 | Genesis 2000, Inc |
| .W3 | APL2000 | Arquivos de dados | APL+Win Workspace File | APL+Win | APL2000 |
| .W3C | WinCatalog.com | Arquivos de dados | WinCatalog Collection File | WinCatalog | WinCatalog.com |
| .W51 | Corel Corporation | Arquivos de dados | Corel WordPerfect 5.1 Document File | Corel WordPerfect | Corel |
| .W52 | Corel | Arquivos de dados | Corel WordPerfect For Windows Document | Corel WordPerfect | Corel |
| .W98 | Microsoft Corporation | Arquivos de dados | Microsoft Windows 98 Related Data | Microsoft Windows | Microsoft Corporation |
| .WAB | Microsoft Corporation | Arquivos de dados | Windows Address Book | Microsoft Outlook Express | Microsoft Corporation |
| .WAC | Wacom | Arquivos de dados | Inkling Sketch XML File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .WAL | Nullsoft | Arquivos de dados | Winamp Modern Skin | Nullsoft Winamp | Nullsoft |
| .WALKER | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .WAT | IBM | Arquivos de dados | IBM Voice Type Languages Map Data | IBM Voice Type | IBM |
| .WBC | Threefold Photos, Inc. | Arquivos de dados | Webshots Collection File | fCoder Group Image Converter Plus | fCoder |
| .WBF | Microsoft Corporation | Arquivos de dados | Microsoft Windows Batch File | Microsoft Notepad | Microsoft Corporation |
| .WBM | Jamie Cameron | Arquivos de dados | Webmin Module | Webmin | Jamie Cameron |
| .WBN | University of New South Wales Water Research Laboratory | Arquivos de dados | WBNM Flood Hydrograph Model File | WBNM | University of New South Wales Water Research Laboratory |
| .WBT | Nabi Studios | Arquivos de dados | Toribash Help File | Toribash | Nabi Studios |
| .WC2 | AllNetic | Arquivos de dados | Working Time Tracker File | Working Time Tracker | AllNetic |
| .WCAT | WinCatalog.com | Arquivos de dados | WinCatalog Collection File | WinCatalog | WinCatalog.com |
| .WCD | Microsoft Corporation | Arquivos de dados | Microsoft Works Calendar File | Microsoft Works | Microsoft Corporation |
| .WCF | Microsoft Corporation | Arquivos de dados | WebEx Saved Chat Session | Microsoft Notepad | Microsoft Corporation |
| .WCI | Microsoft Corporation | Arquivos de dados | Microsoft Indexing Service Catalog File | Windows XP | Microsoft Corporation |
| .WCK | Bentley Systems | Arquivos de dados | WaterCAD Data | WaterCAD | Bentley Systems |
| .WCL | Interscape | Arquivos de dados | WellCAD Log File | WellCAD | Interscape |
| .WCP | Corel | Arquivos de dados | WinDVD Creator Project File | Corel WinDVD | Corel |
| .WCT | FairLogic Systems | Arquivos de dados | WordCast Project | WordCast | FairLogic Systems |
| .WD3 | MetaProducts® Systems | Arquivos de dados | Offline Explorer Data File | Offline Explorer | MetaProducts® Systems |
| .WDF | Workshare | Arquivos de dados | Workshare Compare DeltaFile | Workshare Compare | Workshare |
| .WDQ | MetaProducts® Systems | Arquivos de dados | Offline Explorer Queue File | Offline Explorer | MetaProducts® Systems |
| .WDT | SYNAMETIRCS | Arquivos de dados | WinSQL Schema Diff Template | WinSQL | SYNAMETIRCS |
| .WDY | PC SOFT | Arquivos de dados | WINDEV Run-time Template File | WinDev | PC SOFT |
| .WEA | Autodesk, Inc. | Arquivos de dados | Ecotect Weather File | Ecotect Analysis | Autodesk, Inc. |
| .WEBPART | Microsoft Corporation | Arquivos de dados | Microsoft SharePoint Web Part File | Microsoft SharePoint | Microsoft Corporation |
| .WEF | Microsoft Corporation | Arquivos de dados | Microsoft Exchange File System Format | Microsoft Exchange Server | Microsoft Corporation |
| .WER | Microsoft Corporation | Arquivos de dados | Windows Error Report File | Microsoft Notepad | Microsoft Corporation |
| .WESTERN | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .WF1 | IHS Global, Inc. | Arquivos de dados | EViews Work File | EViews | IHS Global, Inc. |
| .WFK | Embarcadero Technologies | Arquivos de dados | Delphi Data File | Delphi (IDE) | Embarcadero Technologies |
| .WFL | Ultimus | Arquivos de dados | Offline Design For Workflow Process File | Ultimus Adaptive Business Process Management Suite | Ultimus |
| .WFLOW | Apple | Arquivos de dados | Apple Automator Workflow Data | Apple Automator | Apple |
| .WFM | Avid Technology | Arquivos de dados | Pro Tools Wave Cache File | Avid Pro Tools | Avid Technology |
| .WFO | Embarcadero Technologies | Arquivos de dados | Delphi Runimage File | Delphi (IDE) | Embarcadero Technologies |
| .WG2 | IBM | Arquivos de dados | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .WGC | WatchGuard | Arquivos de dados | WatchGuard Log | WatchGuard | WatchGuard |
| .WGN | Grassland, Soil and Water Research Laboratory | Arquivos de dados | SWAT Weather Generator Input | SWAT | Grassland, Soil and Water Research Laboratory |
| .WGT | Interscape | Arquivos de dados | IMPS Data File | CSPro | Interscape |
| .WGX | WatchGuard | Arquivos de dados | WatchGuard VPN Security Certificate | WatchGuard | WatchGuard |
| .WHM | Relic Entertainment | Arquivos de dados | Warhammer 40,000: Dawn Of War Model File | Warhammer 40K Dawn of War | Relic Entertainment |
| .WHT | Microsoft Corporation | Arquivos de dados | Microsoft NetMeeting White Board Document File | Microsoft NetMeeting | Microsoft Corporation |
| .WIC | XnSoft | Arquivos de dados | J Wavelet Image | XnView MP | XnSoft |
| .WID | SAP | Arquivos de dados | SAP BusinessObjects Web Intelligence File | SAP BusinessObjects Business Intelligence | SAP |
| .WIN32 | Outertech | Arquivos de dados | GetDiz Data | GetDiz | Outertech |
| .WIQ | Microsoft Corporation | Arquivos de dados | Microsoft Visual Studio Work Item Query Data | Microsoft Visual Studio | Microsoft Corporation |
| .WIX | Magix Software GmbH | Arquivos de dados | Xara Internal Graphics Data File | Xara Designer Pro X | Magix Software GmbH |
| .WIZHTML | Microsoft Corporation | Arquivos de dados | Microsoft Access HTML Template File | Microsoft Access | Microsoft Corporation |
| .WJF | Corel | Arquivos de dados | WinZip Job File | WinZip | Corel |
| .WJR | Softonic Developer Hub | Arquivos de dados | ReGet Deluxe Data | ReGet Deluxe | Softonic Developer Hub |
| .WK1 | IBM | Arquivos de dados | Lotus Worksheet | Microsoft Excel | Microsoft Corporation |
| .WK4 | IBM | Arquivos de dados | Lotus Lotus 1-2-3 V4 Worksheet | Gnumeric | Open Source |
| .WL | Interscape | Arquivos de dados | WISCO Word Power Word Lists And Definitions Data | WISCO Word Power | Interscape |
| .WLF | Microsoft Corporation | Arquivos de dados | Microsoft Windows 98/Me Dr. Watson Log | Microsoft Windows | Microsoft Corporation |
| .WLG | Porpoise Media | Arquivos de dados | Well Logger V1 File | Well Logger | Porpoise Media |
| .WLK | Davis Instruments Corp. | Arquivos de dados | Weatherlink Data File | WeatherLink | Davis Instruments Corp. |
| .WLS | Renault | Arquivos de dados | R-Link Update File | R-Link Toolbox | Renault |
| .WLT | Unknown Developer | Arquivos de dados | WaveL Wavelet Compressed Graphic | Unknown Software | Unknown Developer |
| .WLV | REL Software | Arquivos de dados | Web Link Validator File | Web Link Validator | REL Software |
| .WM2D | Design Simulation Technologies, Inc. | Arquivos de dados | Working Model 2D Data | Working Model | Design Simulation Technologies, Inc. |
| .WMB | Conitec | Arquivos de dados | 3D GameStudio Map Entity File | 3D GameStudio | Conitec |
| .WMI | WorldMate | Arquivos de dados | WorldMate Itinerary Data File | WorldMate | WorldMate |
| .WMO | World Meteorological Organization | Arquivos de dados | WMO Binary Format File | Unknown Software | Unknown Developer |
| .WMR | All Alex Inc. | Arquivos de dados | Windows Media Recorder File | WM Recorder | All Alex Inc. |
| .WNA | Wider Networks | Arquivos de dados | WIND Tunnel Assignment File | Wind Tunnel | Wider Networks |
| .WND | Mark Finney | Arquivos de dados | FARSITE Optional Wind File | FARSITE | Mark Finney |
| .WNG | Whitenoise Laboratories, Inc. | Arquivos de dados | Personal/Group/Network File Security | EnterpriseVirtual Drive Encryption Engine (VDEE) | Whitenoise Laboratories, Inc. |
| .WNK | Satish Kumar | Arquivos de dados | Wink Presentation | Wink | Satish Kumar |
| .WO | Data Access Worldwide | Arquivos de dados | DataFlex Web Object | DataFlex | Data Access Worldwide |
| .WOC | Micrografx | Arquivos de dados | Windows OrgChart Organization Data | Graphics Works | Micrografx |
| .WOMEN | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .WP2 | Rick Parris | Arquivos de dados | Winplot File | WinPlot | Rick Parris |
| .WP3 | Microsoft Corporation | Arquivos de dados | Microsoft Photo Story Project File | Photo Story | Microsoft Corporation |
| .WPF | Corel | Arquivos de dados | WordPerfect Form | Microsoft Word | Microsoft Corporation |
| .WPK | Corel | Arquivos de dados | WordPerfect Macro | Corel WordPerfect X8 | Corel |
| .WPR | Apple | Arquivos de dados | Apple Logic Studio WaveBurner Plug-in Preset File | Logic Pro X | Apple |
| .WPT | Corel | Arquivos de dados | WordPerfect Template | Corel WordPerfect X8 | Corel |
| .WPZ | Naviter | Arquivos de dados | SeeYou Waypoint File | SeeYou | Naviter |
| .WQC | Wondershare Software Co., Ltd. | Arquivos de dados | QuizCreator Data | QuizCreator | Wondershare Software Co., Ltd. |
| .WQL | Microsoft Corporation | Arquivos de dados | Microsoft Office Data | Microsoft Office | Microsoft Corporation |
| .WRAP | Aladdin Systems | Arquivos de dados | ShrinkWrap MAC File | ShrinkWrap | Aladdin Systems |
| .WRD | Open Source | Arquivos de dados | COREX Manually Verified Word Segmentation Data | COREX | Open Source |
| .WS | MicroPro International Corp. | Arquivos de dados | WordStar Document | Corel WordPerfect X8 | Corel |
| .WS5 | Rob Barnaby | Arquivos de dados | WordStar For Windows 5 Document File | Wordstar | Rob Barnaby |
| .WSD | MicroPro International Corp. | Arquivos de dados | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSE | Symantec Corporation | Arquivos de dados | Wise File Format | Wise Package Studio | Symantec Corporation |
| .WSG | Department of Wind Energy at the Technical University of Denmark, Denmark | Arquivos de dados | WAsP Site Locations File | WAsP | Department of Wind Energy at the Technical University of Denmark, Denmark |
| .WSL | In-Situ Inc. | Arquivos de dados | Win-Situ Data Logger Data | Win-Situ | In-Situ Inc. |
| .WSM | Symantec Corporation | Arquivos de dados | Wise Package Studio Merge Module | Wise Package Studio | Symantec Corporation |
| .WSP | Microsoft Corporation | Arquivos de dados | SharePoint Solution Package | Microsoft Visual Studio | Microsoft Corporation |
| .WSR | Genius Media Group | Arquivos de dados | Crossword Genius Data | Crossword Genius | Genius Media Group |
| .WSS | Microsoft Corporation | Arquivos de dados | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .WSV | Konica Minolta | Arquivos de dados | Konica Minolta SpectraMagic Data | SpectraMagic NX | Konica Minolta |
| .WSW | Aignes | Arquivos de dados | WebSite-Watcher Bookmark | WebSite-Watcher | Aignes |
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