AddType Application .html .htm

[rutame]

Hello to everybody,

I have some problems with embeded php in files with extension .html. For this works i had added .html and .htm to /etc/apache2/vhost/Vhost_Ispconfig.conf and all works fine, but some times that entry dissapears and all leave to works.

My question is: How i can add .html to virtualhost file permanently?

Thank you very much