hmm, I just saw this while looking for info-

[Speech Recognition with Windows XP]
Published: September 23, 2003

[Hooking into Windows XP Speech

So what can you do now?

Tapping into the speech recognition technology within Windows XP can be a little tricky, but after reading this, you'll be a pro.

The magic of speech recognition happens when three pieces come together. First, you need Windows XP Service Pack 1. Next, you'll need the Microsoft Speech Recognition Engine v5.0. Finally, you need an application that's ready to accept your speech input, these include Notepad, Outlook Express, and others in Windows XP.

There is no Speech Recognition Engine (SRE) built directly in to Windows XP. You need to install a compatible engine, and in most cases, you'll install it from one of two sources.
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The Microsoft SRE for Windows XP is available in Office XP applications, such as Microsoft Word 2002, or Microsoft Excel 2002. If you have Office XP, or one of these programs on your computer, then you probably already have access to the SRE. You simply need to install the SRE as explained below.
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A third option is available for advanced users. The SRE is provided for free as part of the Microsoft Speech Software Development Kit 5.1. Microsoft provides no technical support for this software and it is not generally recommended for end users. ]
more-
http://www.microsoft.com/windowsxp/u...ptember23.mspx