Sadly :( It was abandoned years ago...

For Win 7, you can easily compile with .NET core 6 and Avalonia framework for .NET core 6.

I have tested it and it works :)

Yes, also a great project :)

Well, I claim that there is no violating of Original copyright whatsoever. The repository doesn't contain any of the contents of the original game disks or any of the files. You could argue that I used a small parts of the work, but that can only fall under https://en.wikipedia.org/wiki/Fair_use doctrine.

It is complicated.

Many games license art works from third parties, in which the game house agreed only to use that art work in one game title.

E.g. a sound track on a game may feel like a small part of the whole game, but it can the complete work from a music producer.

Well, the 'intel opcodes' are just a proof of concept. It was important, for me, to prove it could be done. If you look deeper in the available code there is already a bunch of code that has nothing to do with 'intel opcodes'.

On 'It's very unlikely this sort of approach...' I will say Why not?

The process of rewriting the code is that the one side is describing the functionality in details and the other side writes the 'clean' code. That's what I'm trying to do. The 'intel opcodes' describe the functionality, and I'm writing the clean code.

I believe https://en.wikipedia.org/wiki/Clean-room_design is the best practice in this situation.

I'm the author of OpenCiv1 project. The main point of such project is to fix the bugs and to provide additional features. Also, there are multiple live discussions on Civ Fanatics Forums on how to modify Civ1. The people still have endless creativity for Civ1 and this is the way to give it to them :)