Finds Drupal files by name and lists out where they are being used (i.e. what nodes or users are associated with it)

find-drupal-files-by-where-they-are-being-used.php

<?php
// Save this, edit it and then...
// Run this with something like drush -v @sitename scr filename.php
// If a file is found and known to be in use, the use will be listed as an array of data.

// Edit the "card-1.xls" part.
$fid = db_query("SELECT fid FROM {file_managed} WHERE filename = 'card-1.xls'")->fetchField();

if ($fid) {
  $file = file_load($fid);
  var_dump(file_usage_list($file));
}
else {
  echo "file not found";
}