We investigated both Google Desktop Search and Windows Desktop Search integration, but neither appears to support it in a way that would be useful for files with hierarchical documents/data [1-4].
To also make your documents accessible to desktop search engines, link it in UR (rather than storing) or periodically export the entire database to documents (the next release will support command-line export to automate this).
[1]
http://tinyurl.com/3yl4jx
[2]
http://desktop.google.com/dev/indexapi.html
[3]
http://forums.microsoft.com/MSDN/Sho...24234&SiteID=1
[4]
http://addins.msn.com/devguide.aspx