You cannot extract the content from this file alone. You must have all parts (e.g., part001.rar, part002.rar ... part006.rar ... part500.rar) in the same folder [1].
I can help troubleshoot the extraction process if you tell me what happens when you try to open it. 500.part006.rar
This is the 6th part of a large file that has been split into smaller, manageable chunks (likely 500 total, or a 500MB+ set) to facilitate easier downloading or sharing [1]. You cannot extract the content from this file alone