To successfully open and merge these files, follow these steps:

You will need a specialized unzipping program installed to handle this format:

Are you or getting a specific error message when trying to open it?

Install the official RAR app by RARLAB from the Google Play Store.

To extract the content locked inside, you cannot open this file by itself. Large files are often cut into smaller pieces (like part01.rar , part02.rar , and part03.rar ) to make downloading and sharing much easier. How to Extract Your Multi-Part RAR

You need to download every single segment belonging to the set (Part 1, Part 2, etc.).