The "Parent" game contains all the primary data. The "Clone" games (regional variations, bootlegs) contain only the files that differ from the parent. To play a clone, you must have the parent zip file in your folder. This saves massive amounts of hard drive space.
So you have a folder full of zip files claiming to be "0.134u4." How do you verify it? Mame 0.134u4 Romset
What or hardware (PC, Raspberry Pi, Handheld) are you using? The "Parent" game contains all the primary data