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.