Flash8/AS2: Stylesheet onload fails. Why? I am so stumped

I copied code to load a stylesheet from one (working) FLA file to new FLA file. New file does not work. Old one does.

Code:

my_ss = new TextField.StyleSheet();
my_ss.onLoad = function(success) {
    if (success) {
        trace("myStyle.css loaded");
    } else {
        trace("myStyle.css did not load");
    }
};
my_ss.load("text/myStyle.css");

I get output that myStyle.css did not load.

Have double, triple, quadruple++ checked the path. It is correct.

Is it a problem with the stylesheet file itself? I’m working in BBedit, file has DOS line breaks.
(should it be saved DOS UNIX MAC? Unicode?)

Flash Publish Settings: Flash Player 8
Load: Bottom up
Actionscript 2.0

Suggestions? Ideas for how to further troubleshoot to understand what, exactly, is not loading?