Dreamweaver #include

I have used includes with coldfusion before and I know how powerful they can be.

I have never tried using it with straight HTML before. I have created a header.html in an includes folder. I have done some research and I have also tried *.ssi and *.shtml but none of them work. What am I doing wrong?

My calls in Dreamweaver:

<!–#include virtual=“includes/header.shtml” -->
<!–#include virtual=“includes/header.ssi” -->
<!–#include virtual=“includes/header.html” -->

I post it and it doesn’t work.