@Tobias a pull request has been made to get this script in to the master lua scripts repo.
@phweyland per your suggestion in the near future I’ll be making a quick edit to this to move the Open In Explorer button to the selected images widget.
In regards to the comments above, in case I was not clear: This script is intended only to open selected files in explorer. Each selected file will open a new explorer window with the image highlighted/selected.
If you are looking for a script to send files to an external application please refer to my OpenInPS script which can be easily assigned to any program: