Isus.rar -

You will need archive software like WinRAR or 7-Zip to look at the contents of a .rar file.

Here is what I can tell you about managing a .rar file like "isus.rar": isus.rar

did you find "isus.rar" (e.g., inside a software folder, email attachment)? You will need archive software like WinRAR or

To give you the exact "feature" or information you need, could you tell me: inside a software folder

"ISUS" sometimes refers to "InstallShield Update Service."

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.

are you trying to do with it? (e.g., scan it for safety, extract its contents, know what it belongs to)?