problem parsing html as php with .htaccess

[HarryPW]

No errors today in the Apache log concerning php or htaccess (only about ispCP and Horde)

This is the .htaccess file I want to use
RemoveHandler .html .htm
AddType application/x-httpd-php .php .htm .html
ErrorDocument 404 /error404.html

I also changed
AddType application/x-httpd-php .php .htm .html
into
AddHandler php-fastcgi .html

still didn't work.
It looks like a .htaccess file can't be used in the domainroot.

WR
Harry