Running an internal exe in java

Running an internal exe in java

Im able to run exe's in runtime via Runtime.getRuntime().exec(filePath),
but this only seems to work for external exe's outside of the jar. I want
to run an exe that I've packaged inside of the jar. How would I do this?
I'd believe theres a jar load function, because I've seen code that loads
it the same way using the name of the file in the jar, but that returns an
IO error for me.