This is a highly compressed archive. The original game is approximately 4.7 GB. This reduced size usually means radio stations or high-quality textures may have been removed or heavily compressed to save space.

You will need a tool like WinRAR or 7-Zip to open the .rar file.

For a more modern experience with better graphics and bug fixes, many users prefer the Definitive Edition Project which includes quality-of-life improvements over the original release.