Ok, I've followed the instructions, I've got MedManager and It has created the proper folder and cfg file for me. Good. I put my modified Export_descr_unit.txt and descr_projectile.txt in the new data folder. I increased the range of mortars from 300 to 3000 and I made their area of effect 5 times as much.

But nothing happens. I use medmanager to launch my mod, and nothing is different. My mortars are exactly the same. What am I missing?