HTML files via PHP engine?

[doni49]

I've got a strange issue going on and I don't know what to do about it. I'm using a hosting account (server info is quoted below--copy/pasted from CPanel). I've got my main domain and two add-on domains. I HAD all of them config'd to have all HTML files processed via the PHP engine. Last night, the main domain and one add-on domain stopped processing the PHP code that's in the HTML files but one of the add-on domains is still processing the PHP code.

I could have sworn that I used either "Apache Handlers" or "MIME Type" on the CPanel to do this. But I can't get it to work now. When I created a file called phpinfo.php (with one line: <?php phpinfo(); ?>) and loaded it, it DID work. So the PHP engine IS working.

Operating system Linux
Kernel version 2.4.21-47.0.1.ELsmp
Machine Type i686
Apache version 1.3.37 (Unix)
PERL version 5.8.0
Path to PERL /usr/bin/perl
Path to sendmail /usr/sbin/sendmail
Installed Perl Modules Click to View
PHP version 5.1.6
MySQL version 5.0.27-standard
cPanel Build 10.9.0-CURRENT 56
Theme cPanel X v2.6.0
cPanel Pro 1.0 (RC36)

[Spiral]

If you are wanting to parse .HTML files as PHP scripts then you need to have
the appropriate AddType command in your .htaccess file either in the root page
of your site or in the folder where the .HTML files are located.

IE: AddType application/x-httpd-php .html

Note that the above only works if the server where your site is located is
running PHP as a standard Apache module.

If PHP is running as a CGI such as with phpSuExec or SuPHP then your
adding PHP parsing of HTML files to your .htaccess file will not work!

(Note: Your phpinfo() page will tell you if PHP is running as a CGI or Module)