I have a Cardbox directory and within it I keep the Database file and the FMT file. I keep the application file in the same directory with a shortcut icon on the desktop. Whenever I update the database, I copy it only to an external drive which I keep as a backup. I keep overwriting any existing database on the external drive as I update them.
Indeed: [name].fil + [name].fmt = Cardbox Database.
then "do I have to tell it where to look or will it know automatically ":
If you close the program Cardbox **without first closing the database window**, Cardbox will start up with the last used (database)window again using file <my documents>\Cardbox\cardbox.cbw. This file is automatic created/updated by Cardbox unless you changed that.