Because .rar files are often used to distribute unofficial content, it is important to handle them with caution:
The Groove Coaster community is active in creating custom levels for the PC version or through fans projects like Groove Coaster Wai Wai Party!!!! modding. These archives often contain the .mc (music chart) files and the associated audio. Groove.Coaster.rar
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: Because