| .WFL | Ultimus | Gegevensbestanden | Offline Design For Workflow Process File | Ultimus Adaptive Business Process Management Suite | Ultimus |
| .WFLOW | Apple | Gegevensbestanden | Apple Automator Workflow Data | Apple Automator | Apple |
| .WFM | Avid Technology | Gegevensbestanden | Pro Tools Wave Cache File | Avid Pro Tools | Avid Technology |
| .WFO | Embarcadero Technologies | Gegevensbestanden | Delphi Runimage File | Delphi (IDE) | Embarcadero Technologies |
| .WG2 | IBM | Gegevensbestanden | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .WGC | WatchGuard | Gegevensbestanden | WatchGuard Log | WatchGuard | WatchGuard |
| .WGN | Grassland, Soil and Water Research Laboratory | Gegevensbestanden | SWAT Weather Generator Input | SWAT | Grassland, Soil and Water Research Laboratory |
| .WGT | Interscape | Gegevensbestanden | IMPS Data File | CSPro | Interscape |
| .WGX | WatchGuard | Gegevensbestanden | WatchGuard VPN Security Certificate | WatchGuard | WatchGuard |
| .WHM | Relic Entertainment | Gegevensbestanden | Warhammer 40,000: Dawn Of War Model File | Warhammer 40K Dawn of War | Relic Entertainment |
| .WHT | Microsoft Corporation | Gegevensbestanden | Microsoft NetMeeting White Board Document File | Microsoft NetMeeting | Microsoft Corporation |
| .WIC | XnSoft | Gegevensbestanden | J Wavelet Image | XnView MP | XnSoft |
| .WID | SAP | Gegevensbestanden | SAP BusinessObjects Web Intelligence File | SAP BusinessObjects Business Intelligence | SAP |
| .WIN32 | Outertech | Gegevensbestanden | GetDiz Data | GetDiz | Outertech |
| .WIQ | Microsoft Corporation | Gegevensbestanden | Microsoft Visual Studio Work Item Query Data | Microsoft Visual Studio | Microsoft Corporation |
| .WIX | Magix Software GmbH | Gegevensbestanden | Xara Internal Graphics Data File | Xara Designer Pro X | Magix Software GmbH |
| .WIZHTML | Microsoft Corporation | Gegevensbestanden | Microsoft Access HTML Template File | Microsoft Access | Microsoft Corporation |
| .WJF | Corel | Gegevensbestanden | WinZip Job File | WinZip | Corel |
| .WJR | Softonic Developer Hub | Gegevensbestanden | ReGet Deluxe Data | ReGet Deluxe | Softonic Developer Hub |
| .WK1 | IBM | Gegevensbestanden | Lotus Worksheet | Microsoft Excel | Microsoft Corporation |
| .WK4 | IBM | Gegevensbestanden | Lotus Lotus 1-2-3 V4 Worksheet | Gnumeric | Open Source |
| .WL | Interscape | Gegevensbestanden | WISCO Word Power Word Lists And Definitions Data | WISCO Word Power | Interscape |
| .WLF | Microsoft Corporation | Gegevensbestanden | Microsoft Windows 98/Me Dr. Watson Log | Microsoft Windows | Microsoft Corporation |
| .WLG | Porpoise Media | Gegevensbestanden | Well Logger V1 File | Well Logger | Porpoise Media |
| .WLK | Davis Instruments Corp. | Gegevensbestanden | Weatherlink Data File | WeatherLink | Davis Instruments Corp. |
| .WLS | Renault | Gegevensbestanden | R-Link Update File | R-Link Toolbox | Renault |
| .WLT | Unknown Developer | Gegevensbestanden | WaveL Wavelet Compressed Graphic | Unknown Software | Unknown Developer |
| .WLV | REL Software | Gegevensbestanden | Web Link Validator File | Web Link Validator | REL Software |
| .WM2D | Design Simulation Technologies, Inc. | Gegevensbestanden | Working Model 2D Data | Working Model | Design Simulation Technologies, Inc. |
| .WMB | Conitec | Gegevensbestanden | 3D GameStudio Map Entity File | 3D GameStudio | Conitec |
| .WMI | WorldMate | Gegevensbestanden | WorldMate Itinerary Data File | WorldMate | WorldMate |
| .WMO | World Meteorological Organization | Gegevensbestanden | WMO Binary Format File | Unknown Software | Unknown Developer |
| .WMR | All Alex Inc. | Gegevensbestanden | Windows Media Recorder File | WM Recorder | All Alex Inc. |
| .WNA | Wider Networks | Gegevensbestanden | WIND Tunnel Assignment File | Wind Tunnel | Wider Networks |
| .WND | Mark Finney | Gegevensbestanden | FARSITE Optional Wind File | FARSITE | Mark Finney |
| .WNG | Whitenoise Laboratories, Inc. | Gegevensbestanden | Personal/Group/Network File Security | EnterpriseVirtual Drive Encryption Engine (VDEE) | Whitenoise Laboratories, Inc. |
| .WNK | Satish Kumar | Gegevensbestanden | Wink Presentation | Wink | Satish Kumar |
| .WO | Data Access Worldwide | Gegevensbestanden | DataFlex Web Object | DataFlex | Data Access Worldwide |
| .WOC | Micrografx | Gegevensbestanden | Windows OrgChart Organization Data | Graphics Works | Micrografx |
| .WOMEN | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .WP2 | Rick Parris | Gegevensbestanden | Winplot File | WinPlot | Rick Parris |
| .WP3 | Microsoft Corporation | Gegevensbestanden | Microsoft Photo Story Project File | Photo Story | Microsoft Corporation |
| .WPF | Corel | Gegevensbestanden | WordPerfect Form | Microsoft Word | Microsoft Corporation |
| .WPK | Corel | Gegevensbestanden | WordPerfect Macro | Corel WordPerfect X8 | Corel |
| .WPR | Apple | Gegevensbestanden | Apple Logic Studio WaveBurner Plug-in Preset File | Logic Pro X | Apple |
| .WPT | Corel | Gegevensbestanden | WordPerfect Template | Corel WordPerfect X8 | Corel |
| .WPZ | Naviter | Gegevensbestanden | SeeYou Waypoint File | SeeYou | Naviter |
| .WQC | Wondershare Software Co., Ltd. | Gegevensbestanden | QuizCreator Data | QuizCreator | Wondershare Software Co., Ltd. |
| .WQL | Microsoft Corporation | Gegevensbestanden | Microsoft Office Data | Microsoft Office | Microsoft Corporation |
| .WRAP | Aladdin Systems | Gegevensbestanden | ShrinkWrap MAC File | ShrinkWrap | Aladdin Systems |
| .WRD | Open Source | Gegevensbestanden | COREX Manually Verified Word Segmentation Data | COREX | Open Source |
| .WS | MicroPro International Corp. | Gegevensbestanden | WordStar Document | Corel WordPerfect X8 | Corel |
| .WS5 | Rob Barnaby | Gegevensbestanden | WordStar For Windows 5 Document File | Wordstar | Rob Barnaby |
| .WSD | MicroPro International Corp. | Gegevensbestanden | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSE | Symantec Corporation | Gegevensbestanden | Wise File Format | Wise Package Studio | Symantec Corporation |
| .WSG | Department of Wind Energy at the Technical University of Denmark, Denmark | Gegevensbestanden | WAsP Site Locations File | WAsP | Department of Wind Energy at the Technical University of Denmark, Denmark |
| .WSL | In-Situ Inc. | Gegevensbestanden | Win-Situ Data Logger Data | Win-Situ | In-Situ Inc. |
| .WSM | Symantec Corporation | Gegevensbestanden | Wise Package Studio Merge Module | Wise Package Studio | Symantec Corporation |
| .WSP | Microsoft Corporation | Gegevensbestanden | SharePoint Solution Package | Microsoft Visual Studio | Microsoft Corporation |
| .WSR | Genius Media Group | Gegevensbestanden | Crossword Genius Data | Crossword Genius | Genius Media Group |
| .WSS | Microsoft Corporation | Gegevensbestanden | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .WSV | Konica Minolta | Gegevensbestanden | Konica Minolta SpectraMagic Data | SpectraMagic NX | Konica Minolta |
| .WSW | Aignes | Gegevensbestanden | WebSite-Watcher Bookmark | WebSite-Watcher | Aignes |
| .WTG | Department of Wind Energy at the Technical University of Denmark, Denmark | Gegevensbestanden | WAsP Wind Turbine Generator Data | WAsP | Department of Wind Energy at the Technical University of Denmark, Denmark |
| .WTL | Microsoft Corporation | Gegevensbestanden | Windows Test Technologies Logger Results | Windows Hardware Certification Kit | Microsoft Corporation |
| .WTR | Microsoft Corporation | Gegevensbestanden | Encarta File | Microsoft Encarta | Microsoft Corporation |
| .WTS | Serif | Gegevensbestanden | WebPlus Theme Set | Serif WebPlus | Serif |
| .WUP | Ipswitch, Inc. | Gegevensbestanden | WhatsUp Gold Network Map File | WhatsUp Gold | Ipswitch, Inc. |
| .WUS | WUSSOFT | Gegevensbestanden | WUTG Tagged Audio File | WUSSoft AutoSound | WUSSOFT |
| .WVD | StarMoney | Gegevensbestanden | StarMoney Zvl32 Filter | StarMoney | StarMoney |
| .WVE | Wondershare Software Co., Ltd. | Gegevensbestanden | Wondershare Filmora Project File | Wondershare Filmora | Wondershare Software Co., Ltd. |
| .WVF | Yokogawa Electric Corporation | Gegevensbestanden | Yokogawa Waveform Data | Waveform Viewer | Yokogawa Electric Corporation |
| .WVS | Ember software | Gegevensbestanden | Wanvas Data | Wanvas | Ember software |
| .WVT | Unknown Developer | Gegevensbestanden | Compuwx Export Data | Unknown Software | Unknown Developer |
| .WWS | Microsoft Corporation | Gegevensbestanden | Microsoft Works Wizards File | Microsoft Works | Microsoft Corporation |
| .WXP | Open Source | Gegevensbestanden | Wax 2.0 Project | DebugMode Wax | Open Source |
| .WXR | Open Source | Gegevensbestanden | WxWindgets Resource Data | wxWidgets | Open Source |
| .WXY | Riot Games | Gegevensbestanden | League Of Legends Wooxy Skin | League of Legends | Riot Games |
| .WYC | wyDay | Gegevensbestanden | WyBuild Version Number | WyBuild | wyDay |
| .WYT | CAST Group of Companies Inc. | Gegevensbestanden | WYSIWYG Template | WYSIWYG software | CAST Group of Companies Inc. |
| .WZD | Sharp Corporation | Gegevensbestanden | Sharp Wizard Program File | Sharp Wizard | Sharp Corporation |
| .X01 | Corel Corporation | Gegevensbestanden | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X02 | Corel Corporation | Gegevensbestanden | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X05 | Corel Corporation | Gegevensbestanden | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X06 | Corel Corporation | Gegevensbestanden | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X09 | Corel Corporation | Gegevensbestanden | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X1 | X1 Technologies | Gegevensbestanden | X1 Desktop Search Saved Search Data | X1 | X1 Technologies |
| .X16 | Macromedia | Gegevensbestanden | Macromedia Extra Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .X1D | Vicon Motion Systems Ltd | Gegevensbestanden | Vicon Unprocessed Data | Vicon Nexus | Vicon Motion Systems Ltd |
| .X1S | X1 Technologies | Gegevensbestanden | X1 Desktop Search Saved Search Data | X1 | X1 Technologies |
| .X1Z | X1 Technologies | Gegevensbestanden | X1 Saved Search Archive | X1 | X1 Technologies |
| .X5 | Rockwell Automation Inc. | Gegevensbestanden | Rockwell Software Logix 5 File | RSLogix 5 | Rockwell Automation Inc. |
| .X50 | Jeffrey C. Johnson | Gegevensbestanden | XTreeGold Help Data | XTree | Jeffrey C. Johnson |
| .XAC | Tilted Mill Entertainment | Gegevensbestanden | SimCity Societies Game File | SimCity Societies | Tilted Mill Entertainment |
| .XBC | SMART Technologies | Gegevensbestanden | SMART Notebook File | MimioStudio | Mimio |
| .XBD | Xerox | Gegevensbestanden | DocuWorks Binder File | DocuWorks Viewer Light | Fuji Xerox |
| .XBIN | Macecraft Software | Gegevensbestanden | RegSupreme License Data | RegSupreme | Macecraft Software |
| .XBK | SMART Technologies | Gegevensbestanden | SMART Notebook File | MimioStudio | Mimio |
| .XBT | SMART Technologies | Gegevensbestanden | SMART Notebook Template File | SMART Technologies Notebook | SMART Technologies |
| .XCD | NetLabs | Gegevensbestanden | WarpIN Data File | WarpIn | NetLabs |
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