plugin.php

<?php

/**
 * FAQ template for Display Posts 
 *
 */
function be_dps_faq_template( $output, $original_atts ) {
  
  $file = plugins_url( 'dps-faq-template.php' );
  if( 'faq' == get_post_type() && file_exists( $file ) ) {
    ob_start();
    include( $file );
    $output = ob_get_clean();
  }
  
  return $output;
}
add_action( 'display_posts_shortcode_output', 'be_dps_faq_template', 10, 2 );