Modyfying .reg file

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Hey, folks!
That would be cool to modify Etherlords II. I also tried to do it myself. But unfortunately I encountered some problem. That's why I need to ask some question. Do you have any ideas on how to modify sorcery and enchantment spells (like change damage of zapp spell from 1 to 2) and also special abilities of monsters (like spiting of finguses or dispell of pteroses). Seems like this information doesn't placed in "regs.res". Do you know which file is responsible for this piece of information. And also do I have any chance to edit this file?

Hi! .res - game archive file, try eipacker: https://allods.gipat.ru/files/ei/soft/eipacker_1_4.zip
.reg - packed version of .ini, try eipacker ^^^
Also, some game logic can be in scripts.res, it contain packed Lua language files. You need dissasebler for it. In my version of game Lua 4.0.1, and i use this tool: https://github.com/retrodump/CFLuaDC-Lua4-Decompiler