The file that controls the mapping from file extension to mime type
is /usr/local/apache/conf/mime.types

<p>The files in /usr/local/apache/conf are under cvs in the apache
repository.
<pre>
cvs -d /home/cvsgigascale co apache
edited apache/conf/mime.types
cvs commit -m "Added pot extension for ppt files" apache/conf/mime.types                                            
</pre>

<p>Update the master version:
<pre>
su - www
cd /usr/local/apache/conf
cvs update
</pre>

<p>Became root
and restarted the server with
<pre>
/etc/init.d/apache* stop
/etc/init.d/apache* start
</pre>

See also <a href="http://embedded.eecs.berkeley.edu/dopsysadmin/faq/49.html">Restarting the website</a>