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[Eagle of Fire]

Apocalypse is very hard to run on modern computer. Sometimes it works fine without any kind of change, other times it just refuse to run altogether.

First logic step would be to suggest to you to use DOSBox. However, it would be usefull to know your computer specs and your OS before that.

I have a whole site dedicated to Xcom games which I can try to dig out of my archive. I used that site a long time ago to make Apocalypse work on my '98 machine and it worked fine. If you still have problems, I'll look for it.