To make your web server (I'm assuming Apache) interpret .html as PHP, you need to edit your httpd.conf, and add it to the application type. You'll see a line that looks something like : AddType x-phpblahalhba PHP
You need to add HTML on to that too. (I can't remember if it's .html or .php) ... but that's how you do that.
For your second question... yes, it's possible, but not really necessary. You'd need to change it a bit... I assume you're talking about something like: index,0,32,3,232,3,212,12.html
However, for this to work you need to change a certain server setting too... one I can't remember now.
Hope this helps though!
Kevin