menu Tools -> Options
on the Advanced tab, File Paths button
and enter the path in the Drawings area (use the ... button to browse
to the path). An empty path here uses your My Documents folder.
Many Thanks, now I found where the keys (the settings about the default
directories) are wrote in the registry so I'm able to create a custom ADM to
add to the gpo of Office and set the default directories of Visio2003 for all
my pcs.
best regards