You need WinRAR or 7-Zip to combine the parts into the final .nsp file.
This file format is designed for modified Nintendo Switch consoles or PC-based emulators like Ryujinx or Yuzu . 🎮 Game Overview: Persona 5 Persona 5 (NSP)(US)(Base Game).part2 (2).rar
Do you have the of the archive (Part 1, Part 3, etc.)? You need WinRAR or 7-Zip to combine the parts into the final