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To play multiplayer Hellfire retail (After following Sticky Guide by Pond86):
-Install LogMeIn Hamachi
-Create a channel and invite friends
-Go to Hellfire install directory and run the ipxwrapper.exe (This is assuming you ran the Hellfire Enhanced. In my case I put all my Hellfire files in the GOG Diablo install folder, yes the one GOG Diablo runs out of)
-Make sure Hamachi is your primary and when you highlight Hamachi in the list that it is checked
-Start multiplayer and choose LAN (IPX)

I can confirm that the cowquest, barb, monk, nest, and bard work. I haven't had Theo or the crypt spawn yet (or I havent gotten there yet, clvl10)

Happy Slaying