Don't know how to make this module work

Even I have read the README.txt of this module, I still don't know how to make this module to work.
Lets say I have a default css that for all different kinds of web browsers:
stylesheets[all][] = css/all.css
with one of the selection inside:
h1, h1.title{color:yellow;}

And I want to change the color of h1 to red only for IE, so I make a conditional stylesheet for IE:
stylesheets-conditional[IE][all][] = css/ie.css
with one of the selection inside:
h1, h1.title{color:red;}

After clear the caches. Nothing change. It still shows the yellow color.
Is this the right method to override another css file ?