F5dd.part30.rar

Based on common file-naming conventions found in online databases and file-sharing networks, this specific naming pattern is often associated with: 1. Large Software or Game Installers

Do you have the or the full name of the folder this file came from? That would help in identifying exactly what is inside. F5DD.part30.rar

You must have every part in the sequence (from part 1 to the final part) saved in the same folder. Based on common file-naming conventions found in online