Formally dukeres.zip (i recommend everyone else remane the file to stop confustion with the other dukeres.zip file( that should be renamed dukeresSVGA.zip, since this file changes dukes Monitor resolution)
What is DukeResART?
With DukeResART you are able to make changes into the duke3d.grp file (not recommended), to add new ART-files to this GRP-file or to make single ART-files containing your new bitmaps. Move art images with copy and paste, from .art file to .art file....