AS3 Loading... and getting data inside swf

Okay I’ve resolved the issues but here’s a question I still need an answer to if possible.

I loaded a file and when it’s loaded let’s say I want to apply [COLOR=Blue]evt.currentTarget.content[/COLOR] to a variable.

What is evt.current.content? Like when I define the variable to hold it.
Like:

var total:Number = 100;

but what would

var file:[COLOR=Red]???[/COLOR] = evt.current.content;

be?

Thanks again.