: The native tool for this format. Right-click the first volume and select "Extract To...".

The file is the second segment of a multi-part compressed archive. Because it is a split volume, it does not contain the full data on its own; it requires the presence of all other parts (such as part1.rar , part3.rar , etc.) to be successfully decompressed. Understanding Multi-Part RAR Files

If you have the other associated parts, you can extract the contents using these popular tools: