How to load assets dynamicly

I'm making a simple multiplayer game with animate.
I would like to create a patch system so I can distribute patches to clients.

I would like to do this by having a passworded archivives that can be accessed by AS.

I know how to edit and load zip file data but how can I load something in the archive say an asset / ana file

into memory so it can be displayed.

I want to essentially do something like below

loader.load(new URLRequest("asset.ana"));

addChild(loader);

when I try this though it says it does not understand the file type of .ana

I tried looking up how to do it but havnt found anything.

if there is any api documentation or info on how to load assets into memory like a movieclip 

please let me know.

NOTE: I don't want to load external swfs I want to load the MCs and buttons and so on dynamicly