htaccess not forwarding for 404 errors

Can someone tell why the following htaccess file does not forward users to my notfound.html file when they key in a bad address?

AddHandler Extension_Type .html .htm .php3 .php4

Action Extension_Type /cgi-bin/php.dat

Options -Indexes

ErrorDocument 404 /notfound.html

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ([^\.]+)$ index.php?FixedTitle=$1

PHP:

Thanks,
B

 

Try this.

AddHandler Extension_Type .html .htm .php3 .php4
Action Extension_Type /cgi-bin/php.dat
Options -Indexes

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ([^\.]+)$ index.php?FixedTitle=$1
RewriteRule (.*) /notfound.html [L]

PHP:

 

I get an "internal server error" when I add that last line of code

 

try

Options All -Indexes
Options +FollowSymlinks
RewriteEngine on

AddHandler cgi-script .cgi .pl .html .htm .php3 .php4

Action Extension_Type /cgi-bin/php.dat

Options -Indexes

ErrorDocument 404  /notfound.html
ErrorDocument 403  /notfound.html

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ([^\.]+)$ index.php?FixedTitle=$1

Code (markup):