That's no excuse
Anyway, if you have the rom, it is just a matter of finding the emulator to use with that rom. Then altering the emulator into letting you play MS4 if it doesn't work right away. You can find .dats and different files to allow you to play. If you use a older version of Nebula, 2.18 or so, then it shouldn't be much of a problem.
Otherwise find the smaller rom file for nrx and use that.