Nope. It's just Windows. HOWEVER there's:
WABI - Windows Application Binary Interface
WAIK - Windows Automated Installation Kit
WAM - Web Application Manager
WAMP - Windows, Apache, MySQL, PHP
WAMPP - Windows, Apache, MySQL, PHP an…
WBT - Windows Based Terminal
WCF - Windows Communication Foundation
WDDM - Windows Device Driver Model
WDF - Windows Driver Foundation
WDI - Windows Diagnostic Infrastructur…
WDK - Windows Driver Kit
WDM - Windows Driver Model
WDMCSA - Windows Driver Model Connecti…
WDS - Windows Deployment Services
WEI - Windows Experience Index
WEP - Wired Equivalent Privacy
WER - Windows Error Reporting
WF - Workflow Foundation
WFC - Windows Foundation Classes
WFP - Windows File Protection
WFP - Windows Filtering Platform
WFW - Windows for Workgroups
WGA - Windows Genuine Advantage
WHDC - Windows Hardware Developer Cent…
WHIIG - Windows Hardware Instrumentati…
WHQL - Windows Hardware Quality Lab
WIA - Windows Image Acquisition
WIA - Windows Imaging Architecture
WIIS - Windows Internet Information Se…
WIM - Windows Image
WIM - Windows Imaging Format
WinFLP - Windows Fundamentals for Lega…
WinHEC - Windows Hardware Engineering…
WINS - Windows Internet Name Service
WINS - Windows Internet Naming Service
WinSAT - Windows System Assessment Too…
WIX - Windows Installer XML
WLK - Windows Logo Kit
WLM - Windows Live Messenger
WLO - Windows Libraries for OS/2
WMA - Windows Media Audio
WMI - Windows Management Instrumentati…
WMI - Windows Management Interface
WMP - Windows Media Player
WMSRT - Windows Malicious Software Rem…
WOSA - Windows Open System Architectur…
WOW - Windows on Windows
WPA - Windows Product Activation
WPE - Windows Protection Error
WPF - Windows Presentation Foundation
WQL - WMI Query Language
WRP - Windows Resource Protection
WSC - Windows Security Center
WSIM - Windows System Image Manager
WSK - Windows Socket Kernel
WSRM - Windows System Resource Manager
WSS - Windows Sound System
WSUS - Windows Server Update Services
WUA - Windows Update Agent
WVG - Windows Vector Graphics
There's so many of them! :D