>We get the message "File 'c:\windows\temporary internet files\content.ie5>\cdu7s9qj\ema.dbc' does not exist".

Now you see one of the problems with ADs: you can't do USE http://myserver.com/mytable.dbf. There are two possible solutions. One, you can use the NET USE command to map a drive to the server. Two, you can use RDS, which is basically ADO over HTTP.