Hi bEniE,
Well, actual it shouldn't be so hard at all.
You can map any extension to any handler I think.
Take a look at the AddHandler directives in your httpd.conf.
Although it might not be advisable, because parsing every .html file on big sites causes performance loss.
But if you have one big dynamic site, what can you do ... 🙂
I tested it, but I cannot rely on my apache build, it does not work correct, I was testing some Web_dav code in it.
Good luck.