TinyMCE editor files in MOODLE 2.7 -

TinyMCE editor files in MOODLE 2.7 -

in moodle using tinymce editor. here button insert special characters available. build in button tinymce. image of button given below..

i have customise button function adding more symbols extra. can't find file edit. file contains functions of insert special character button. , resides. moodle/lib/editor/tinymce directory can't find necessary files. please 1 help me find...

i using moodle 2.7 version.

the symbols in file

/lib/editor/tinymce/tiny_mce/3.5.8/themes/advanced/js/charmap.js

tinymce moodle