The ".part3.rar" extension indicates this is the third volume of a multi-part RAR archive . Because modern games like No More Heroes 3 are large—often exceeding several gigabytes—they are frequently split into smaller segments for easier sharing or hosting on various platforms. You cannot open this file in isolation; you typically need all segments (part1, part2, etc.) in the same folder to extract the full game installer or data.
Discussion of the No More Heroes Game Series on Switch - Facebook sc23191-NMH3.part3.rar
No More Heroes 3 marks the return of the "otaku assassin" . you typically need all segments (part1