Did you follow the instuctions in the readme? Try loading it like this:
EDuke32.exe /xNWINTER.CON /gNWINTER.grp /gduke3d_xtr.zip /gxtr_update202.zip /gnwinter_hrp.zip
I'm not sure if the XTR Update Pack is spelled correctly. I don't override it, I manually edit it.
I'm not sure why it wouldn't work. Remember that you cannot load the XXX Pack (the babes are different), the SD_Duke mod, Maphacks Reloaded, or the DukeDC or Caribbean HRPs, although I don't know why you would.
It works great on my computer. The 4 images currently added work, the undef.def works, and the copies.def is working too.
NightFright, the link to my site on your site is wrong. It is "http://www.freewebtown.
com/hendricks266/index.html", not "http://www.freewebtown.
org/hendricks266/index.html".
We all make mistakes!