Xtree was the name of a legendary
file manager for
DOS based systems. Contrary to
Microsoft Explorer and other contemporary filemanagers,
Xtree's main focus was on being
productive, not
fancy.
Xtree had (has!) a legion of fans. Some people would use Xtree for everything, including all kinds of file operations like copying and moving files around, editing, visualization, etc.
Unix users can get a taste of Xtree (actually a full featured clone) with unixtree. Windows users can use ztreewin.