Most if not all old pre-Windows era games for Ms-Dos were never meant nor suited for modifications by players, open modding became an accepted standard much later, around 2004 or so.
There might be some fan-made tools for a few Ms-Dos games on fan sites if you search on Google, but that is more of an exception that regularity. Not meaning to dissuade you if you'd like to mod a game, but it might be not an easy thing to do.
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