: Ensure you have downloaded all related files (e.g., parts 1, 2, 3, and 4). If any part is missing or has a different name, the extraction will fail.

: Right-click on Part 1 and select "Extract Here" or "Extract to [Folder Name]". The software will automatically find Part 4 and all other segments to reassemble the original file.

: You cannot open .part4.rar by itself. To extract the contents, you must have every single part of the sequence (Part 1 through the final part) saved in the same folder. How to Extract the Contents

: If Part 4 is corrupted, the extraction will stop. You may need to redownload just that specific part.

Because this is a specific file fragment rather than a known software or public dataset, there is no official "long guide" for it. However, Understanding Multi-Part RAR Files