#
#In config 
#$config['url_suffix'] = '';
#
#q2uri.php
#$_SERVER['PATH_INFO']   = '/';
#$_SERVER['REQUEST_URI'] = '/?search='.$_GET['search'];
#$_SERVER['SCRIPT_NAME'] = '';
#

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^(.*)\.htm$ /q2uri.php?search=$1 [L]
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]