I have read many threads but I can't find the answer to this.

My template does not have a /includes/template/custom_template/common/tpl_main_page.php

All I have is:

html_header.php
tpl_columnar_display.php
tpl_footer.php
tpl_footer_menu.php
tpl_header.php
tpl_header.php.bk


I have tired a few files, nothing seems to work.

Perhaps someone can point me to the right file?