What is .RBJ file extension?
File used by XRK (Extra Redcode Kit), a program that simulates battles between "warriors" that are programmed in a low-level assembly language called Redcode; stores compiled source code and is used to simulate one warrior's actions against another's in XRK.
Extra Redcode Kit is based on the Core Wars programming game, which was initially released in 1984. XRK is a complete development system that allows development, compilation, and battle simulation.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.