What you are trying to do has been tried many times over the years with no success. Labiri wanted PvPGN support for his Rebirth mod: http://www.diablorebirth.net (Which is quite the thrill if you get a chance to play it)
Recently I have taken on the challenge, and while I'm just a computer whiz kid, I'm not able to reprogram both PvPGN and Hellfire to talk to each other in the correct manner. I think the best shot Hellfire has would be if we found a version of PvPGN that worked on Diablo v1.04 as that's the version that Hellfire is based upon. That's still not a guarantee..
I wrote three blog posts showing my work and it's kinda left hanging right now but I can tell you that it doesn't end well.
Recently I have taken on the challenge, and while I'm just a computer whiz kid, I'm not able to reprogram both PvPGN and Hellfire to talk to each other in the correct manner. I think the best shot Hellfire has would be if we found a version of PvPGN that worked on Diablo v1.04 as that's the version that Hellfire is based upon. That's still not a guarantee..
I wrote three blog posts showing my work and it's kinda left hanging right now but I can tell you that it doesn't end well.
http://khanduras.net/2013/08/hellfire-with-pvpgn/
http://khanduras.net/2013/08/hellfire-with-pvpgn-part-2/
http://khanduras.net/2013/08/hellfire-with-pvpgn-part-3/
I'll also warn you that the PvPGN forums are no good for support. Best bet for Hellfire multiplayer at this time is Tunngle.