How to (batch) rename multiple selcted(!) files (which

... have no specific common name patterns) *) ? How can I do this, e.g. in the script mode (when I try out the scripting window only the FIRST of the selected files is renamed in the previewe window or - this would result in an error - all the other files would be renamed to the new name of the first(!) file (what is not intended and not possible). Any idea ? Thanks.

) Example. I want to rename the files abc.txt, x1y2aa.xls and 1234567abde.jpg to newfile_xxx. where xxx is a auto-numbering and * should keep the old extension(s) ... (and where I have selected (marked) the old files in the DOpus explorer window)