| .W3D | Adobe Systems Incorporated | Instellingsbestanden | Adobe Shockwave 3D File | Adobe Director | Adobe Systems Incorporated |
| .WAT | IBM | Instellingsbestanden | IBM Voice Type Languages Map Data | IBM Voice Type | IBM |
| .WB4 | Stardock Corporation | Instellingsbestanden | WindowBlinds Default Skin | WindowBlinds | Stardock Corporation |
| .WC | Valve | Instellingsbestanden | Valve Hammer Configuration File | Valve Hammer Editor | Valve |
| .WCR | Open Source | Instellingsbestanden | Ergane Configuration File | Ergane | Open Source |
| .WCX | Microsoft Corporation | Instellingsbestanden | RemoteApp And Desktop Connections Configuration File | Remote Desktop Manager | Devolutions |
| .WCZ | SoftShape | Instellingsbestanden | Chameleon Clock Wallpaper File | Chameleon Clock | SoftShape |
| .WFC | Microsoft Corporation | Instellingsbestanden | Windows Wireless Network Settings File | MacroMates TextMate | MacroMates |
| .WFP | Turtle Beach Corporation | Instellingsbestanden | WaveFront Program File | Turtle Beach WaveFront Software | Turtle Beach Corporation |
| .WFW | Microsoft Corporation | Instellingsbestanden | Windows Firewall Policy File | Microsoft Windows Server 2016 | Microsoft Corporation |
| .WFX | Adobe Systems Incorporated | Instellingsbestanden | Adobe User Keyboard Shortcut Settings | Adobe Creative Cloud | Adobe Systems Incorporated |
| .WIF | Canyon Art | Instellingsbestanden | Weaving Interchange Format File | Art WeaveIt (Art iWeaveIt for iOS and Android) | Canyon Art |
| .WLM | Pierre-Emmanuel Gougelet | Instellingsbestanden | CompW Image Format File | XnView MP | XnSoft |
| .WME | Microsoft Corporation | Instellingsbestanden | Windows Media Encoder Session File | Microsoft Windows Media Encoder 9 | Microsoft Corporation |
| .WMS | Microsoft Corporation | Instellingsbestanden | Windows Media Skin | Microsoft Windows Media Player | Microsoft Corporation |
| .WMZ | Microsoft Corporation | Instellingsbestanden | Compressed Windows Media Player Skin | Microsoft Windows Media Player | Microsoft Corporation |
| .WPJ | Watcom International Corporation | Instellingsbestanden | Watcom C/C++ Project | Watcom C/C++ | Open Source |
| .WPP | Serif | Instellingsbestanden | WebPlus Project File | Serif WebPlus | Serif |
| .WPS | Kingsoft | Instellingsbestanden | Kingsoft Writer Document | WPS Office | Kingsoft |
| .WPZ | Naviter | Instellingsbestanden | SeeYou Waypoint File | SeeYou | Naviter |
| .WS | MicroPro International Corp. | Instellingsbestanden | WordStar Document | Corel WordPerfect X8 | Corel |
| .WSA | Sonicle | Instellingsbestanden | WebSynth Media File | WebSynth | Sonicle |
| .WSP | Microsoft Corporation | Instellingsbestanden | SharePoint Solution Package | Microsoft Visual Studio | Microsoft Corporation |
| .WSS | Microsoft Corporation | Instellingsbestanden | Microsoft Windows Sound System File | Microsoft Windows | Microsoft Corporation |
| .WSW | Aignes | Instellingsbestanden | WebSite-Watcher Bookmark | WebSite-Watcher | Aignes |
| .WS_ | Unknown Developer | Instellingsbestanden | Visc15 Adressen Setup File | Unknown Software | Unknown Developer |
| .WWK | Corel Corporation | Instellingsbestanden | Corel WordPerfect Keyboard Layout File | Corel WordPerfect | Corel |
| .WWP | Microsoft Corporation | Instellingsbestanden | Microsoft Works Wizards File | Microsoft Works | Microsoft Corporation |
| .WWS | Microsoft Corporation | Instellingsbestanden | Microsoft Works Wizards File | Microsoft Works | Microsoft Corporation |
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