Originally Posted by alank2
Should I use .shtml for every page or just ones with includes in them?
There are advantages and disadvantages to both ways.
If you use that extension for all your pages then the pages that don't have includes will load slightly slower because the server has to check if they have includes in them before sending them to the browser.
The advantage that might offset this is that it allows you to add includes into a page that doesn't yet have them without having to rename the file.