Visio IFilter 2003 Add-in: Text Search in Visio Files

From Microsoft:

With this download, you can extend the text search features in Microsoft Windows, Microsoft Office and Microsoft SharePoint Products and Technologies to include searching within Microsoft Office Visio 2003 files. Visio binary and XML formats are supported. The Microsoft Visio IFilter 2003 is a component used by the Microsoft Windows Indexing service and Microsoft Office SharePoint Portal Server 2003 to extract text strings from Microsoft Visio files (.VSD, .VSS, .VST, .VDX, .VSX, and .VTX formats).

The text strings are then indexed by these servers and the resulting indices are made available to several client applications that provide a user interface to search for text strings in files. These search clients include Visio 2003 Find Shape, Windows 2000 and Windows XP File Explorer search, Office 2003 search, Microsoft Windows SharePoint Services 2003 search, and SharePoint Portal Server search. This version is the first release on CNET Download.com.