did you find "isus.rar" (e.g., inside a software folder, email attachment)?
"ISUS" sometimes refers to "InstallShield Update Service." isus.rar
To give you the exact "feature" or information you need, could you tell me: did you find "isus
You will need archive software like WinRAR or 7-Zip to look at the contents of a .rar file. did you find "isus.rar" (e.g.
are you trying to do with it? (e.g., scan it for safety, extract its contents, know what it belongs to)?