Both the hardware and the software (i.e. the operating system) change over time and they aren’t always made compatible with their previous counterparts.
Games, like most software, are created and tested for some specific operating system, meaning they might not be compatible with later releases of that operating system.
Game developers could theoretically update the games to make them compatible with newer operating systems, but most don’t bother, especially if it makes little sense financially (as is usually the case with really old games).
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