These are .settings files that are designed with a menu system for ease-of-use so you don't have to fiddle around with a hand full of nodes in Fusion. These are primarily set up to be used on the edit page but can also be used within Fusion itself.
These are .settings files that lack a menu system. Most fusion templates will be set of pre-configured selection of nodes that you'll have the ability to edit individually within the node tree.
These are .drp files that contain all of the project data but no project media.
These are .dra folders that contain a project file and all project media.