SSI file name .html/.stm (Server Side Includes)

[jackdack]

Are there any implications for using different filename extensions such as .html or .stm/.stml?
I will use SSI on all web pages except a [phpbb] forum. My host is flexible to which file extension I use. I heard using .html may be better for some search engines. I've seen other SSI sites using .stm which is short. I'd appreciate any advice or factors for consideration before I go build the site.

Thank you

[Span]

Welcome to the forums, jackdack.

I always used .html for SSI. It looks better and no one can see what you're doing. One security risc less.
But you can use any file extension you want, as long as you or your host makes your server parse them for SSI directives. Search engines don't care about file extensions. Just make sure they are served as text/html.

[jackdack]

thanks for the reply and the welcome!

[jackdack]

Are there any implications if I'm also running a phpbb forum on the site?
Thanks