You are dealing with a security 'sand box' issue. FF
correctly keeps from the server the exact location of the file on
the users hard drive, since the theory is that this information can
be used to 'hack' the users computer in the future. IE is using an
'unsafe' method.
Kronin555 is correct. The only good use for the type="file"
is in conjuction with upload code. I am sure you will find that the
other browsers all pass dis-similar information from that field, as
they all have different concepts of security.