Creating an executable jar file using Matlab

I am trying to write a script that will update a videogame (minecraft) for me. I am getting hung up because many of the steps require modifying executable jar files (basically just folders containing a bunch of class files). It is pretty trivial to do this using WinRAR, but due to the number of times I have to do this, it is rather time consuming and I'd like to do this solely in a Matlab script.

In summary, I am looking for a way to either copy files into a pre-existing executable jar OR to be able to convert a folder containing the class files into an executable jar.... without requiring any interaction (i.e. having to copy/paste using WinRAR or something).

Thanks in advance!

[Stephen]

unless someone has made a jar file reader on the file exchange, I don't think matlab is the way to go with this. maybe something as basic as a bin file would work, but I'm not familiar with java and jars and all that. you might want to check out 7z or some other archiving software for possible tools. good luck