This is Duke!Zone, a Unofficial shovelware pack, It contains 150 levels for Duke Nukem 3D and was released by Wizardworks in 1996, This file came originally from Archive.org two years ago and I decided to archive it here. This file is not by me and I don't take credit for it either.
How to install?
If you have a sourceport like Eduke32 pull the maps into the addons folder or if you have the 20th Anniversary or Megaton Edition Place those in gameroot then maps, Installer on this file only works on old PC's.