The General preferences page is accessed by selecting Options, followed by Preferences and finally Archive from the main menu bar.
This page lets you associate Magellan Explorer with different archive types. When you do this you will be able to double click the archive from outside of Magellan Explorer and have it launch automatically and open the archive.
It is recommended that you check all the options if you have no other archive management software installed. If, on the other hand, you have another archive management application installed you may wish to leave certain file types associated with that application.
No matter what selections you use here you will still be able to open archives internally inside Magellan Explorer.