mod_headers not working

I have a few servers. Mod_headers works on all of them but 1. I have checked the list of enabled apache modules and headers_module is one of them. I am using the module to force direct downloads of mp3 files so that the browser does not use it's flash player to play the mp3. What could be causing this problem?

This is what I'm using
Code: 
<IfModule mod_headers.c>
Header unset Content-Type
Header unset Content-Disposition
Header set Content-Disposition attachment
Header set Content-Type application/octet-stream
Header add Content-Type application/force-download
Header add Content-Type application/download
Header unset Content-Transfer-Encoding
Header set Content-Transfer-Encoding binary
</IfModule>

 

 

 

 

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