And you can usually drag the file into the graphic screen.
For often used files, there are automatic methods to load them upon demand. Read about 'AUTOLOAD' or numerous other solutions. I use the temporarily defined target command name to load its file, with a short bit of lisp code, that will load the file, into a main file that is loaded each session:
(defun c:Your-Cmd () (if (load "c://Some-path//You-File-name") (c:Your-Cmd ) ) )
The ' (c:Your-Cmd ) ' executes that command, if all went OK.
S