A single part (like part 08) cannot be opened or used on its own. You must have every preceding and following part in the same folder to successfully extract the data.

If the extraction fails at part 08, it usually means that specific file is corrupted or incomplete. In this case, you would need to redownload just that part.

The filename refers to a specific piece of a multi-part compressed archive. Based on the naming convention, this file is the 8th segment of a larger data set, likely related to a software update or installation package for Age of Empires III: Definitive Edition (AOEIII DE) version 1329985. Understanding Multi-Part RAR Archives

To access the contents of this archive, you should follow these steps using standard extraction software:

The original software for RAR files, which allows you to right-click and "Extract Here" to merge the parts automatically.