MAME 2003 Plus is a (the version used in the original Xbox’s MAMEoX) but with backported drivers, bug fixes, and game compatibility improvements from later MAME versions. It’s not just a vanilla 0.78 — it’s a curated plus version.
: Follow the setup instructions for your operating system. This usually involves extracting the emulator and setting up the path to your ROMs. mame 2003 plus