wp-plugin-file-decoder.php

<?php

$dirname = dirname(__FILE__);
$decoded = $dirname . '/' . 'decoded';

$files = glob("{$dirname}/*.cache");

foreach($files as $file) {
	$decoded_filename = base64_decode(str_replace('.cache', '', basename($file))) . '.php';
	$decoded_filecont = base64_decode(file_get_contents($file));
	file_put_contents("{$decoded}/{$decoded_filename}", $decoded_filecont);
}