As much as I remember reading about it somewhere, there are some dungeons and other things in both games, which cannot be entered / used while in either of the two games alone. When you install the two games together though (all files in the same folder I think), those unusable locations suddenly become freely accessible - which ultimately expands both games for an even bigger world. The combination of two games was called World of Xeen.
It's an unusual, but very interesting concept, which no other game seems to have ever reproduced - essentially it's easier to provide a complete game from the start instead.
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