However, a direct search does not return a widespread, notable file by that exact name. It is highly likely this is a private, custom, or potentially broken file link, or a meme reference from a specific Discord server or community, rather than a widely known file.

did you see this file (e.g., YouTube video, Discord server, gaming forum)? What game or software is this file supposed to be for?

I can try to find specific information on what "PotatoKKKKKKKKKK.rar" does.