by milanstojanov on WordPress.org
This plugin adds a new column in WP-Admin->Pages which will let you know what template file is used for every page.

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If you are a WordPress theme developer, this little plugin is a great tool for you. It will add a new column next to page title in WP-Admin->Pages, and let you know what template file is used for every page. Also, it makes possible to filter pages by registred template files in the system (please see Screenshots section to see it in action).