External file into dynamic text field?

I’ve got to be short several thousand brain cells. I’ve been trying for an hour to get an external text file to load into a dynamic text field without any luck at all. I’ve Googled all over the place and tried several examples, but none of them seem to work.

Here’s what I’m working with:

Flash MX 2004
external file = “/aboutus.txt”
stylesheet = “/includes/style.css”

I’ve tried loading the external file directly into the text field.
I’ve tried creating a movie clip and loading it into that.

I just can’t get the hang of this. I don’t know what I’m screwing up. I’d post my AS code, but I’ve changed it so many times now there’s nothing really coherent there.

If someone could give me some help, I’d appreciate it.