Agreed. I was just inquiring as to the possibility, so that other Users could see if it is possible. Also, for the MAME Cores, it would allow for other Games, and more stable Games. Example, Fighter's History. MAME2003 (0.78), it is Unplayable. But MAME2010 (0.139), it is Playable. Yes, there will be Games that wont run, no matter the Core. But there are more possibilities.
Oh, and by the way, the Mortal Kombat II+ Hack........works perfectly in 2003

. It will give a Message saying there is something wrong with the Files, but other than that, runs as it should