When you encounter a file named Groove.Coaster.rar , it generally falls into one of these categories:

Because .rar files are often used to distribute unofficial content, it is important to handle them with caution:

Use software like WinRAR or 7-Zip to extract the contents, as these handle the .rar format most reliably. How to Use the Extracted Content If the file contains custom songs for the Steam version:

Locate your game’s installation folder (usually under SteamApps/common/Groove Coaster ).

Follow the specific instructions provided by the modding tool you are using (such as the Groove Coaster Chart Editor ).