Let me know in the comments, and I’ll help you troubleshoot! If you'd like, I can help you refine this post by:

To the uninitiated, these filenames are a secret code. Here is exactly what you are looking at: Generally shorthand for Pokémon Ultra Sun . EUR: The European region release.

Exploring Your Digital Collection: A Deep Dive into POKUS EUR Decrypted

You should end up with a .3ds or .cci file.

Use a tool like WinRAR or 7-Zip . Right-click on Part 1 and select "Extract Here." The software will automatically pull data from the other parts to create a single file.

The "Decrypted" version by the TD group. Decrypted files are essential if you plan to use an emulator like Citra on your PC or Steam Deck, as standard encrypted ROMs won't boot without extra work.