Thanks it would still be interesting to see this added to xz but supposing the fact that LLM's were able to create the rars project, I suppose it might not be that difficult to add that to rar format eventually. Starting to do it from xz might make the most sense if you like the idea right though.

Another idea for rar format that I have which I would love to hear your opinion on is that there are sometimes multiple .part01 .part02 .part03 and so on

I have found that when you try to unrar it, it requires all the files at the particular.

It would be really beneficial imo if it was possible to have the ability if there was some ability to somehow just unrar .part01 without requiring all the contents of .part02,03 etc.

but from my very limited understanding, you also need some (I think last contents) of all files for the de-compression to work.

Would it be possible to do something of this endeavour so that you don't require all the parts themselves but just something of a patch of an end, I am not sure about compression algorithms if that might be possible though but it felt like something which was a bit possible albeit hard/difficult to do with rar format.

I would be curious to hear your opinions on it, and thanks for responding and I would be really interested in seeing the xz fork that you mentioned!