htaccess and utf-8

[simple123]

hello,



i found this code in my htaccess :

RewriteEngine on
AddDefaultCharset UTF-8
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule /?([A-Za-z0-9-]+)/?$ index.php?id=$1 [L]


I dont know from where this is.
can anyone tell me if this is a problem with the contact form v1.7 ?

i deletedt AddDefaultCharset UTF-8
because i got error letters "Ä" and "Ö" from the mailer.

but after some time the contact form did not work anymore.

the provider told me that all is ok on his server.

please help

thanks.