I dont know exactly WHY, but it seems the user expects IE an ICS to retrieve a zero size file correctly, like Firefox and Chrome does. According what the user says, the problem is IE/ICS interpret this zero file, like an 'Unauthorized resource'. I don't know if this is really a HFS problem, or if HFS may do something about this. It seems this is the way IE/ICS works, and there is nothing HFS can do to change this (correct me, if I'm wrong).