Draxxus

Can anyone help me figure out how to open and edit cdlc that is already published? The tutorials I've seen jsut talk about cvreating cdlc from scratch. I'd like to open some cdlc and add in sections for riff repeater and maybe even change some notes here and there to clean it up. I tried unpacking it in toolkit but I have a ton of files and none are eof files. Any tutorials already created about this? Thanks!