mod_rewrite is the mode I was talking about. I've copy pasted the part about url rewriting of the .htaccess supplied by COPS :
Code:
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule ^download/(\d*)/(\d*)/.*\.kepub\.epub$ fetch.php?data=$1&db=$2&type=epub [L]
RewriteRule ^download/(\d*)/(\d*)/.*\.(.*)$ fetch.php?data=$1&db=$2&type=$3 [L]
RewriteRule ^download/(\d*)/.*\.kepub\.epub$ fetch.php?data=$1&type=epub [L]
RewriteRule ^download/(\d*)/.*\.(.*)$ fetch.php?data=$1&type=$2 [L]
</IfModule>
Hope that helps.