Directory Opus is a highly advanced file manager originally developed for the Amiga by Jonathan Potter and GPSoftware, first released in 1990. It replaced the standard Workbench file management with a dual-pane interface, customizable button banks, and extensive ARexx scripting capabilities, making it the preferred file manager for power users. The software featured unprecedented customization options and functionality that influenced modern file managers, with versions ranging from the original DOpus 1 through to the final Magellan releases (versions 4 and 5) for AmigaOS.