Since .rar files are archives (similar to .zip), the "features" depend on what is inside the file. Common scenarios for a file with this name include:
Textures, sounds, or 3D models for game development (e.g., Unity/Unreal). Rainy-Season.rar
A small indie game or a modification for an existing game. Rainy-Season.rar
A collection of images or videos with a rainy theme. Rainy-Season.rar