mod-rewrite, htaccess & permalinks

Hello there,

this is my first post here, my english isnt that good so please be merciful 😀

ive got a really urgent problem with mod rewrite. My Permalinkstructure looks like this %postname%.htm. My Categorybase is just a “.”, so that there is no category name in the permalink-url.
My Problem is that some old urls listed in google link to a directory called “aktuelles”.
The htaccessfile- generated by wordpress:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

It works fine but now i need a tweak which redirects urls from aktuelles/ to the root directory, also the extension has to be changed from html to html:
#RewriteRule ^(.*)aktuelles([^0-9]*)$ $1$2 [R=301,L]
#RewriteRule (.*)\.html$ /$1.htm

The problem is now how to combinate these two things. Im thankful for any advice.Its really urgent, please help me. Im also thankful for resources or a wordpress pro who can fix it quickly.

Thanks in advance

Greetings , Daniel

Danke schonmal!