Isus.rar 99%

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

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

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. "ISUS" sometimes refers to "InstallShield Update Service

To give you the exact "feature" or information you need, could you tell me: downloaded from an untrusted source

did you find "isus.rar" (e.g., inside a software folder, email attachment)?

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