Ok, it took me several hours but I think I worked up a solution.
Well, it's rather compromise than 100% fix but it's better than nothing I would say.
I've tried to dig up to that darn file and noticed that on cd there actually 5 different automap sets. I experimented with it and discovered theyre each for certain performance quality setting. So I tried switching files and sometimes I was able to bring my minimap to normal. Than I just thought about adjosting performance settings and that was it. I lovered it a little bit and now minimap and automap works well.
P.S
But it's still bugging me why this automap file problem is so common, why there are so many messed up versions of this game.
P.S # 2
I'm happy I menaged to solve one problem but now I have another. My "mapless" saves don't want to work. They're crushing my whole system to point where reboot is needed while I'm trying to load them. Yea, I know catacombs are just begining but I also think I were quite lucky with my item drops so I will miss those saves if nothing can be done.
Quick summary:
If you experiencing map problems similar to mine try to go to options, and in video section go to performance. There is quality switch. If you have maxed quality (3d shadows, fog, that doesn't matter) just lower it a bit. This will load different set of maps that hopefully wont be corrupted. If the probem persist try lowering it even more just to try all sets.
Hope it heps.
Cheers.