How prevent IE from adding [1] to name of a file passed by readfile()?

Passing files via a php script

[John Carpenter]

I'm using the following code example from php.net to pass a binary file via a php script:

 header("Pragma: public");
 header("Expires: 0");
 header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
 header("Cache-Control: private",false);
 header("Content-Type: application/octet-stream");
 header("Content-Disposition: attachment; filename=\"".basename($filename)."\";");
 header("Content-Transfer-Encoding: binary");
 header("Content-Length: ".@filesize($filename));
 set_time_limit(0);
 @readfile("$filename") or die("File not found.");

$filename is set for example to /name-2.0.cgm

In Firefox the "Save As" dialog correctly suggests this name. But IE6 suggests the following name: name-2[1].0.cgm

Anyone knows how I can prevent IE from adding the [1]?

[coopster]

MSIE ignores RFC2616. Here is a relative thread that may help:

[webmasterworld.com...]

[coopster]

Here are two other docs from MS. Note, this first doc does not explain how it violates the RFC mentioned earlier. You would think they might mention such a blatant violation ;)

[msdn.microsoft.com...]
[microsoft.com...]