Why not use grep tools? Or if your on windows, you will have Find/Search on your Startmenu, if you goto the advanced propeties you can search for text within files.
95% of templates are the same name at the .php file. so 95% of the time, just looking at the address bar in your browser and changing php to tpl will give you the name of template to edit.
It can be either, tiki-page_bar or tiki-showpage, and some themes override these templates.