I gave a talk about reverse engineering (and binary file formats) at CppOnSea 2022 earlier today. The talk will be online in a while and explains how to reverse engineer the CNR file formats. Hope somebody likes it. I did include the easter eggs (the photo of Eric, plus one in the level files that I think isn't widely known so far). Of course there's a major callout to echosector.com, Keenan (for keeping it running) and Stauff (for ScummVM & implementing it).