From my tweaking with 2h files, I have found they go corrupted or are overwritten by the fatherland file on turn generation. Though *concievably* (as in, a meteor is going to crash into the earth ... tommorow concievably) you might be able to change it and make it not be overlapped by the fatherland file turn generation or force it to generate a certain type or thing. But I don't know for sure and anything is possible.