This is the source code for the launcher and miscellaneous tools for the original RPG Maker 2003 edition of Oneshot. It's based on an older version of RPGLauncer and I don't recommend that you use it at all in your personal projects. It's here mostly for educational purposes and completeness's sake, I guess.
(Seriously, use any RPG Maker made after XP or some other engine entirely instead of trying to be clever and hack around with 2k3.)