Route , remove index.php and use adminer

Hi sorry for english, i use adminer to manage my database.
I insert it on root and if i wante use it i go to mydomain/adminer.php

If i want remove index.php im ust insert the htaccess on root :

Code:

RewriteEngine on
RewriteBase    /
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]

And the sistem work . But i cannot use asminer because i have a 404 page .

How can i solve it ?