This was in the Itch.io launcher, which has it’s own RAR extraction tool. I’ll try again.
EDIT: Downloading this (the RAR one) through Firefox and opening with 7-Zip works, but there is something wrong with the RAR itself: The archive extracts at damn near 300 MB/s until it hits that file, at which point it drops to 90 MB/s and seems to hang for a while before finishing the extraction. Whatever tripped up 7-Zip probably caused Itch.io to just give up…
Also, Itch.io’s client doesn’t see the ZIP at all. We might want to mention that to Itch themselves, but I don’t know if I should or if you should.