EDIT: SOLVED
It’s been too long since I pirated anything other than media. I am on an M2 Mac running Sequoia. Be kind!
That’s a multifile split for when we needed to upload them to places where a max upload limit was set. You need to select all and unzip them. Your un zipper should be able to find the pattern and unzip as one. I don’t think you will be able to do anything if you unzip one by one
This is what happened when I selected all. Maybe I should try a different archive app