Use this toInsert content of a file...
Before invokingA document must be open to use this option.
Menu pathFile > Insert > Insert from File
Command nameMFileInsertFromFile
Accelerator keyF (from the main menu: Alt+F > I > F)
Options on parent menu (Insert+)Insert from File, Insert from URL, Insert Snippet, Snippet Window, Add New Snippet, Edit and Manage Snippets