Still doesn't work. Using Noesis I can open .rez files, export the DATs, but cannot open them. There must be a way, as there are modder - made missions and so...
EDIT: I found a plug- in for Noesis, with it the files can be opened.
EDIT 2: Some files can be opened. I opened one mod (PI Granny), but can't open another or original game files.
EDIT 3: As I opened the world, I can only see the model. I wonder, how player spawn place, opponents, weapons etc. are coded. Surely in .dat file... but Noesis can't see them.