header error or not?

From: Date: Fri, 01 Sep 2000 11:24:16 +0000
Subject: header error or not?
Groups: php.general 
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I try to write scripts like this: header("Content-Type: application/unknown"); header("Content-Disposition: filename=$file_name"); for the file download tracking.but the problem is when the header is sent. There is nothing happen.(Only show blank screen instead ask user to save file as...). What's problem and how should i do? Thank you very much Worawisut

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