This problem is non-fixable (unless you want to convince
all the browser manufacturers to change their products or
can get all your users to use only browsers that
do pass the path). The problem is that the data
you are interested
(path name) isn't passed by some browsers. There is nothing
you can do server-side that would induce the browser to
send the path information. The data you want (path to the
file being uploaded) simply isn't
being passed and there is nothing you can do about it.
I'm sorry but there is nothing you can do to fix
this problem.