A "cartridge image" file that mimics a physical game card. These are often preferred for use with emulators like Yuzu (or its successors) or for loading via custom firmware "game carts".
A "deep content" release for this title generally bundles the following file types: Xenoblade Chronicles 3 Switch NSP/XCI [DLC/Upda...
If you are looking for this specific "deep content" bundle, it is commonly found on community-driven archival sites or forums dedicated to Switch homebrew and backup management. A "cartridge image" file that mimics a physical game card