.Dat Files

I am under going a process of decoding all of combat arms secrets. The next one im working on is the maps. I have already ripped apart the .rez file but i need to get into the .dat files next. Does anyone know how?

i did google it... and i dont want to use what comes up. Does anyone have anything else?

if we knew what program nexon used then we would have a chance to open .dat files. unfortunately we dont unless you wanna hack nexon/break into their offices