Thanks, but there are some problem with virtual drives, see the behavior:

-The fso.DriveExists("j:") returns true
-The fso.FolderExists("j:\dbcfolder") returns false (but exixts)
-The fso.fileexists("j:\dbcfolder\datafile.dbc")returns false (but exists too)
-The server.MapPath("virtualdbcpath") returns the phisical dbcpath.
Then, I dont know what happen it can see the drive but not the folder... I think that I will migrate the database to the local drive or the IIS to the database machine.
Thanks anyway!!

Pedro.