I can help troubleshoot the extraction process if you tell me what happens when you try to open it.
Open only the first part ( .part001.rar or just the .rar file if numbered differently) using your software.
Select "Extract" or "Unzip." The software will automatically combine all parts (including 500.part006.rar ) to rebuild the original file [1]. If you are missing other parts, the extraction will fail. To help you further, could you let me know: Are you getting an ? Do you have all the other parts (part001-005, etc.)?