Finally managed to properly install Caesar III under , to run under the open source re-implementation of the gaming engine, . It wasn't as straightforward under Linux due to case sensitivity on files, and a special tool to unarchive shielded .cab files, but it worked at the end thanks to the wiki. Bear in mind, the game requires the original artwork from 1998 (easily found online).

Ceasar III running under Linux Mint and the Augustus engine
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