The file you're mentioning, "Sackboy_A_Big_Adventure-FLT.part01.rar," appears to be part of a downloadable archive, likely from a game distribution site that offers the game as a download. The ".part01.rar" extension indicates that it's the first part of a multi-part RAR (Roshal ARchive) file, which is a type of compressed file.
"Sackboy: A Big Adventure" is a sequel to the LittleBigPlanet series, continuing the adventures of Sackboy, a small, knit doll-like character known for his cute appearance and endearing personality. The game promises to deliver beautiful graphics, innovative level designs, and a fun, family-friendly gaming experience. It features both single-player and local co-op multiplayer modes, allowing players to navigate through imaginative levels filled with challenges, puzzles, and various obstacles. Sackboy_A_Big_Adventure-FLT.part01.rar