First props to GOG.com for Duke Nukem: Atomic Edition. Great game. My question is this. How do I play mods/levels with this version of the game? I have run setup and selected to mod to play and will "Save and Launch" and an error about full screen comes up. The game runs just fine by itself with the original launch executable but won't in setup. So I am not sure how to play any mods/levels. Please help!!!
Thanks in advance.

try using eDuke32. Put all your mods in a folder of your choosing and then run them through eDuke32. I think a couple of the devs of eDuke32 haunt this forum every now and then and maybe they can help you more with eDuke32.

I have to agree. Use eduke. It's so nice.

Another hat in the ring for eDuke, works fine for me

I wish all old games had something similar to eDuke. Is just... perfect!