I got no clue on decrypting the file.
However Metzone has got around 8 Spawns anyway, so basically you do the work ONE TIME to get all Spawnpoints (use a new server for it where almost no one dares going there) and write them down or remember then, later on when you come back you will know WHERE they will spawn and therefore dun need the extreme HP Bar or bigger monsters at all.
If i get to start conquer today i'll head there and write down the coordinates as all spawnpoints are currently stored inside of me