I have a site with pages with shtml extension, primarily done to have menu navbar display corrctly with SSI. I now am adding a page with php, and to have this page work properly I have given it a php extension, which causes the menu to no longer display. I also frankly find the shtml extension to be an odd one for most who use my site. I would like to change to php extension for all pages if possible, but how do I reformat my SSI to display properly if I no longer use the shtml extension?
The current code of interest is <!--#include virtual="/Navbar.shtml" -->