1) link into the Windows API calls and create your own local funcitons for renaming and copying files. If you follow this, you can rename and copy in one fell swoop if you want to keep the originals.
2) download the CSO functions as mentioned and write the needed code to rename and copy the files.
3) use the built in WInRunner command dos_system() and then all you have to do is figure out the command line parameters and call them line per line, or build a .bat file to call once.
Either is a valid and correct option, depending on your skills with the TSL coding. Give one of those a shot, and if you have any questions after you have attempted coding what you need let us know and we'll help you work through it.