An file is a raw, 1:1 dump of a physical Nintendo Switch game cartridge. Think of it as the digital phantom of the game card.
Xenoblade Chronicles 3 NSP and XCI files are formats used to play Nintendo Switch games on unauthorized hardware or modified consoles. This practice involves significant legal and security risks. Overview of File Formats
Xenoblade Chronicles 3 has received extensive post-launch support through multiple updates and a four-wave Expansion Pass. The following is a summary of the core content, including major technical updates and downloadable content (DLC) additions. Major Expansion Pass Content