Description:
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problem with header and extensions.

I've got counter script. I simply download files as:
counter.php?file=xyz

then in MySQL I check links for xyz and if found i send the file to browser using header("Location: $url");

on Apache 1.3.x everything is OK

on Apache 2.0.x(All 2.0.x!!) there is problem with double extensions e.g.: file_name.tar.gz - it is send as file_name.tar.tar!!!!

single extensions works fine e.g.: pdf, zip etc.

Reproduce code:
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<?
if(isset($_GET["file"])) $url=check($_GET["file"]);

if(isset($url)) header("Location: ".$url);
else "There is no ".$_GET["file"]." file in our database!";
?>


Expected result:
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files with single extension are send - OK.

when i download with this script files e.g.: file.tar.gz it is send as file.tar.tar where on Apache 1.3.x it was sent as file.tar.gz

Actual result:
--------------
see: Expected result