Need help finding code!

I have been going through this tutorial for the past hour that someone posted a link to earlier today and for the life of me, I cannot find the MC with the instance name of target_mc. I also cannot find where they’re referencing to load the external AS. Can someone please help me out??? Attached is the zip with the files and here is the link to the tutorial.

I would greatly appreciate it before I pull all my hair out. Thanks!!

http://www.macromedia.com/devnet/mx/flash/articles/preloader_03.html