css3pie does not work under hfs for some reason.http://www.rejetto.com/hfs/
i'm opening a bug there because it does seem like a bug in the server and not in css3pie.
i'm mainly posting here so people wondering why it's not working find the cause quickly.
it looks like htc files are not well read using hfs.
i advise using a simple nodejs static server instead.
as simple as that:
var express = require('express');
var app = express.createServer();
app.use( express.static( __dirname ) );
app.listen( 3000 );