well, quite frankly this -rwxrwxrwx does not seem to have any impact, I only got that from my ftp-program, I'm aware that the server is on Win NT, but I only have ftp access to it.
the first redirection is in intern.htm, the file contains only

<META HTTP-EQUIV="Refresh"
    CONTENT="0; URL=http://www.lent.ch/intern/cgi-bin/main.cgi">
[download]

the second one is in main.cgi and looks like this:
<td> <a href='/../intern/cgi-bin/folder.cgi?intern/$file'> $file </a></td>
so its just a simple html-link, but these don't work with IE. However, if I create a link to a regular html-file (inside the protected folder), this works fine.