If you use Windows XP and need WDS to index Office 2007 files, or SharePoint, Search Server or any other product that used IFilters then this is the KB article and download for you.  This obviously includes Windows Home Server which uses WDS to enable you to quickly search for a file on a file share from Vista

This download will install and register IFilters with the Windows Indexing Service. These IFilters are used by Microsoft Search products to index the contents of specific document formats. This Filter Pack includes IFilters for the following formats: .docx, .docm, .pptx, .pptm, .xlsx, .xlsm, .xlsb, .zip, .one, .vdx, .vsd, .vss, .vst, .vdx, .vsx, and .vtx.
Because Windows Desktop Search (WDS) consumes IFilters from Windows Indexing Service, the IFilters will be automatically registered and available for use by WDS.
To register these IFilters with a specific Search product, please see the associated KB article below:

• Office SharePoint Server 2007 - Office SharePoint Server 2007 registration steps
• Search Server 2008 - Search Server 2008 registration steps
• SharePoint Portal Server 2003 - SharePoint Portal Server 2003 registration steps
• Windows SharePoint Services v3.0 - Windows SharePoint Services v3.0 registration steps
• Exchange Server 2007 - Exchange Server 2007 registration steps
• SQL Server 2005 - SQL Server 2005 registration steps
• SQL Server 2008 - SQL Server 2008 registration steps

Download details: Microsoft Filter Pack

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David