The last place for some missed files
If you're already searching for archived files, you should consider browsing these :
The Mod Archive
, who meets all your mod needs ;
, where you can find many music games in MID or MOD format ;
, which save web pages but often not files.
The Bug Team's Dukepage
, a website about Duke Nukem 3D and its bugs (French and English).
There is also lots of abandonware websites, search Google for it.