Using .htaccess to enable php/html

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All I'm trying to do is enable my site to utilize php include to duplicate various <div>s on multiple pages (such as navigation), while retaining the .html suffix on said pages.

Here is my current .htaccess file (from root directory, where all my pages are). I have substituted the word "domain" where applicable:

# -FrontPage-

IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*

<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName domain.com
AuthUserFile /home/domain/public_html/_vti_pvt/service.pwd
AuthGroupFile /home/domain/public_html/_vti_pvt/service.grp

Then I added this line at the END of the document:

AddType application/x-httpd-php .html .htm

When I do so and try to open any page on the site (in Chrome), my browser DOWNLOADS the page instead of displaying it.

Any help appreciated.

Ace in PA.