This is a specific Downloadable Content (DLC) pack. It includes iconic Japanese "naked" bikes (motorcycles without fairings), such as the Honda CB1000R and Yamaha MT-10.
If you are currently trying to handle this file, keep the following in mind: RIDE.4.Naked.Japan.Style-CODEX.part04.rar
If you are missing other parts (Part 01, 02, 03, etc.), Part 04 is useless . You need all parts from the exact same upload to extract the files. This is a specific Downloadable Content (DLC) pack