The Duke Nukem 3D Highres Pack for Windows Vista/XP
The Duke3D High Resolution Pack allows you to use much better looking textures than the original game (released back in 1996) had to offer in the first place. It also introduces 3D model replacements for the old enemies/weapons/items sprites. In combination with an OpenGL port like JFDuke3D or EDuke32, this gives Duke Nukem 3D a modernized, more appealing look and even motivates Duke veterans to play through the original episodes once again.
The Duke Nukem 3D Highres Pack all about: http://hrpupdate.duke4.net/index.html