Windows Explorer and Search (indexing service) extract metadata ("file contents", e.g. title, authors, tags) using an "ifilter", a small extension provided by a third party for a specific file type. ArcMap and ArcGlobe enable users to assign such metadata through File | Map Document Properties dialog, but it is not visible outside ArcGIS due to the missing ifilter. I propose ESRI to implement and distribute (as an independent add-on, for starters) such filter so that users could easily find their content.
Regards, Lauri Suoranta Software Engineer ESRI Finland