Problems with uri / Google Manage Domains

[eluser]Rubiz'[/eluser]
The htaccess was made by other programmer:

Code:

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ codeigniter/index.php/$1 [L]
</IfModule>

<IfModule !mod_rewrite.c>
    # If we don't have mod_rewrite installed, all 404's
    # can be sent to index.php, and everything works as normal.
    # Submitted by: ElliotHaughin

    ErrorDocument 404 /index.php
</IfModule>

It can help me?

I need this URL http://mysite.com.br/google5484874.html be valid, and dont be 404 error.
Its possible?