This filename follows a standard pattern used for split archives, often associated with fan-translated games or large media collections. Identification
These archives often require a password provided by the original uploader (check the site where you found the links).
Use WinRAR or 7-Zip to open Part 1, which will automatically pull data from Part 6. Common Issues
You need all parts (Part 1, Part 2, etc.) in the same folder to extract.
If you are missing Part 6, you must download it from the exact same source as the other parts to ensure the checksums match.