CSS menu works with Firefox, Opera, but not with IE

[eluser]mkmkmk[/eluser]
Hi everybody

A very strange situation, so I am unsure how to explain my problem.
The title is not correct: if I parse all thing into a variable and store it with file_put_contents() into a file, yes, than it works also with IE.

This works with FF and Opera, but not with IE: the sub-menues are not displayed.

Code:

$this->parser->parse('header', $data);
$this->load->view('temsilci_menu');
$this->load->view('footer');

Then I tried this:

Code:

$nix = $this->parser->parse('header', $data, TRUE);
$nix .= $this->parser->parse('temsilci_menu', $data, TRUE);
$nix .= $this->parser->parse('footer', $data, TRUE);
file_put_contents('application/views/nix123.php', $nix);
$this->load->view('nix123');

Again: this works with FF and Opera, but not with IE: the sub-menues are not displayed.
But if I change the extention of nix123.php to html and double-click on it, than it works fine with IE.

I hope I was able to describe my problem understandable.


Edit: Tested with 2.1.1 and 2.1.2
Edit2: Tested with IE8