Ensure you downloaded it from the official Pyxeralia Itch.io page or Steam store.
While I cannot directly scan or open a .rar file for a security report, here is the context regarding the software it likely contains: Game Name: Scarlet Tower Developer: Pyxeralia scarlet_tower.rar
If this archive is a legitimate distribution from a developer or a common modding source, it generally contains: Ensure you downloaded it from the official Pyxeralia Itch
Version 2.0.0 (Ashen Nightmare) was recently released with a free DLC. Typical File Contents scarlet_tower.rar