It's on GOG, too (for the same price, when I checked just now). Also, there's a reimplementation of the game engine, which uses the original data/bytecode files: https://github.com/joskid/Another-World-Bytecode-Interpreter

And if you're curious about how it works, there's this great article.

http://fabiensanglard.net/anotherWorld_code_review/