The Files tab controls where the files that Impact Explorer™ uses will be kept by default. Normally these are in the My Documents folder. If you wish to change this location, you can specify a particular directory. If you choose to change this, you should move any files in the previous location to the new one to have them available.
You can choose whether the files are auto-saved when something is changed. Auto-save reduces the chance that you could lose valuable data, but saving can take a moment in larger files. If auto-save is not on, then an alert icon is shown at the bottom of the screen to let you know you need to save. A disk icon is shown when a save is in progress.
The remember recent files option allows you to turn off the recent files list perhaps for confidentiality reasons. You can temporarily clear the list by using the menu item at the bottom of the menu.