"ISUS" sometimes refers to "InstallShield Update Service."
To give you the exact "feature" or information you need, could you tell me: isus.rar
did you find "isus.rar" (e.g., inside a software folder, email attachment)? "ISUS" sometimes refers to "InstallShield Update Service
are you trying to do with it? (e.g., scan it for safety, extract its contents, know what it belongs to)? inside a software folder