External load ALL fies in a folder (no list)

I am having this folder (samples) having many SWF files inside it that I would like to load externally from main.swf. Those SWF files will not always be the same, some might get added, some deleted OUTSIDE main.swf

main.swf -|- …
|- samples

I have 2 questions:

  1. How can I build a list of all file names in folder ‘samples’? I am not aware of a Flash function that can scan a folder and return existing file names inside.

  2. Is it possible to have movies with transparency when loaded externally? Because I don’t know how to create a Flash movie with no background (equivalent to Photoshop’s New/Transparent background)

I am counting on your help. Thanks.