Metallifukinca
What you need to do is then in your shtml file just incude the SSI directive commend, something like
Now I cant remember the exact syntax off the top off my head.
Canvey
Most web servers will be setup to parse shtml, as for the index.html issue, I got around that by just putting a instant redirect in my index.html file to my index.shtml file. That way you dont havew to bother with adding stuff to the .htaccess file.