Flex - Prevent Ie From Decoding A Utf-8 Url In Flash?

I'm finding that in flash (10.x at least) and ie (7, 8, 9) that if I try to load an image url that contains escaped utf-8 characters (p%C3%83%C2%A5) that the characters get decoded before it makes the url request, even if I double or triple encode them. Is there any way to prevent this so the url (with escapes) the way I want it is actually what is requested?

The problem its causing is we give a http status of 301 on utf-8 decoded url requests to the encoded url which flash then tries to request (but ie decodes it again) and I get stuck in an infinite loop because of the 301 + ie auto-decoding.

EDIT, adding code sample:

var url:URLRequest = new URLRequest('http://mydomain.com/p%C3%A5.jpg');
var loader:Loader = new Loader();
loader.load(url);

Now I want the request to go over the line as [URL] (and it does in other browsers), but in IE it goes over the line as [URL]

EDIT: replacing % with %25 (double encoding the %) but that didn't work, it just caused this request to go over the wire: [URL]