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No, the newer versions of MAME require completely redumped roms, so they are completely new versions of the original arcade rom chips. This is why older MAME rom files don't work with newer...

MAME completely changed its rom structure some time ago, meaning that older ROM sets from earlier versions no longer worked at all. It is possible you have a ROM set from an earlier MAME version...

Which game is it exactly?

I just checked and Alien vs. Predator doesn't have any Parent roms and isn't a clone, so it should be a self contained rom set for the game in MAME and run by itself. ...

I actually updated the set a couple of days ago now.

The Rom set isn't much different. It needed just under 1GB to update it.

The CHD set however has grown quite a bit. It is now 311GB and...

Looks like a big update. Do you know the update size yet?

Annoyingly I'm not home till Friday to update the set.

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