While the format itself is safe, compressed files can hide malware. Always use Avast One or other security software to scan archives before extraction.
To open a .rar file, you need third-party software like WinRAR, 7-Zip, or iZip. Popular BASIC Downloads Download BASIC rar
If you are looking for a BASIC environment, several modern and classic versions are available from reputable sources: How to Open RAR Files on Windows, Mac, and Mobile - Avast While the format itself is safe, compressed files
A is a compressed archive that bundles multiple files into one smaller package. While the format itself is safe