<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([A-Za-z]+)\.html iloku.php?il=$1
#RewriteRule ^. index.php [L]
</IfModule>

iloku.php

<?php
echo $_GET['il'];
?>

Bu haliyle çalışıyor.

http://reddoc.net/deneme.html
http://reddoc.net/ivirzivir.html
http://reddoc.net/fgmdfkl.html