With the new version of the uploader path has changed.
Instead of
wp-content/plugins/nextgen-public-uploader/npu-upload.php
use
wp-content/plugins/nextgen-public-uploader/inc/npu-upload.php
I got it 😀
Simply add
<a href="?s=%file_name%">
to your Filebase-Template and a click on the Filename will open the Detailpage
