Adding custom maps to RO server - Part 1. In this Part you will learn how to add your custom maps to your Ragnarok server. ·       Clientside:  Download/create the map you want to add to your Ragnarok Server. a.   You should have 3 files of the map.             i.     [mapname].gat             ii.    [mapname].rsw             iii.    [mapname].bmp   Place your .gat and .rsw files inside your GRF within data\ as well as your .bmp file inside your dat