Consider HFS is not FTP.
FTP is not a generic way to remotely manage files, but a specific one, and not the one used by HFS.
That said, what about the 'hampix' folder? Is that working or it is not as the others?
Don't give up, i have one more advice for you, but please answer my questions first.
I know this is actually an IE6 bug, but since it will be widely used for some months still, i'm trying to find a workaround with your help.