are you trying to do with it? (e.g., scan it for safety, extract its contents, know what it belongs to)?
did you find "isus.rar" (e.g., inside a software folder, email attachment)? isus.rar
Here is what I can tell you about managing a .rar file like "isus.rar": are you trying to do with it
If this file was unexpected, downloaded from an untrusted source, or arrived via email, it is highly recommended to scan it with an antivirus program before opening it. scan it for safety