// unless is_dir = TRUE 'location' is *not* the directory but
// file contained in this directory
// (so ChangePathTo("dir/subdir/xh.htm") sets m_Path to "dir/subdir/")
// unless is_dir = TRUE 'location' is *not* the directory but
// file contained in this directory
// (so ChangePathTo("dir/subdir/xh.htm") sets m_Path to "dir/subdir/")