The .part2.rar extension indicates that this is the second piece of a split WinRAR archive.

NSP vs XCI Switch File Formats Explained for 2026 - Dobber Hockey

You cannot extract this file by itself. You must have all sequential parts (Part 1, Part 2, Part 3, etc.) downloaded in the exact same folder to successfully extract the full game. 🎮 Nintendo Switch Cartridge Image (XCI)