Suggestion: add the file sizes and last-modified dates to the display.
$base_path = ...;
$filename = ...;
// $bytes = file size in bytes
// $mdate_local = file last-modified date (RFC 822 format)
$bytes = filesize ("$base_path/$filename") or die("filesize($filename)");
$mdate_unix = filemtime("$base_path/$filename") or die("filemtime($filename)");
$mdate_local = date('r', $mdate_unix);