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Web Quick
Once bundled with Now Utilities; it is a BookMark manager from EuropaSoftware, and a very good one at that. If you do a lot of web browsing, this is helpful, otherwise go ahead and disable it.
Latest Version: 1.4.0
URL: http://www.europasoftware.com

Web Sharing Extension
An application, not an extension, it will load itself into the memory during computer startup turning your Mac into a Web Server. You can use Web Sharing (inside control panel) to control your Web Server.
Latest Version: 1.5.1 (From Mac OS 8.5)

Welcome Speech 2.0
Plays "Welcome to Macintosh" sound on startup.
 Latest Version: 2.0

WGS SCSI Manager Update
If you are using AppleRAID or SoftRAID on your Workgroup Server 9650, you should install this extension. 'WGS SCSI Manager Update' updates the built-in SCSI Manager to provides support for asynchronous SCSI device requestson 9650. The absence or presence of the WGS SCSI Manager Update extension has no bearing on the performance of your Workgroup Server 9650.
Latest Version: 2.0

WindowLabels
WindowLabels is a System Extension which extends the functionality of the Label menu in the System 7 Finder from just icons to whole windows. (i.e. WindowLabels lets you apply background colors and/or patterns to Finder windows, as easily as you could label Finder icons with the Label menu before.) To open a window, any window, in the Finder. Hold down the option key, and then open the Label menu. Now you can select between any color or pattern shown. When you release the mouse button on a color or pattern, the frontmost window acquires the characteristics you just gave it. Keeping with the “interface” of the current Label menu, you can apply, change, and remove colors and patterns at will.
Latest Version: 1.0
URL: http://www.pair.com/eden

Windows Compressors
Develop by Microsoft. This system extension compresses/decompresses video files in AVI format, Microsoft Video 1, Microsoft RLE and Microsoft Full Frame formats. Allows you to play and convert AVI movies on your Mac using Apple's QuickTime software.
Latest Version: N/A

WinMouse.INIT
Change your Mac Mouse into winMouse.
Latest Version: n/a

WinSock Lib
Provides a single network API common, Windows Winsock networking stack to your Macintosh making it easier to port TCP/IP applications to the Mac OS environment. This allows cross platform software developers to deploy cross platform networking applications without rewriting the networking code for the Macintosh.
Latest Version: n/a

WizzyFonts
A terrific extension that displays all the fonts in your fonts menu in their actual typeface so you don't have to keep searching for the style you want. Very RAM intensive if you have a lot of fonts.
Latest Version: n/a

WorldScript I

WorldScript II

WorldScript Power Adapter

WPSC Video (PPC)

WPSG Video

WriteNow Battery