Contextual Menu Items folder

Loose in the Classic Mac OS System Folder's root level is the Contextual Menu Items folder, which made a Mac OS 8 debut. This folder houses extensible contextual menu models.

Contextual menus appeared as of Mac OS 8 and can be reached by pressing the control key along with a mouse click.

These extensible contextual menu items are used both by Apple and third-party (noticeably shareware) developers.