Once upon a time, in a world dominated by computers and digital files, there lived a tech-savvy individual named Alex. Alex had a huge collection of files, some of which were in .rar format, a type of compressed file that was widely used for bundling and compressing large files or collections of files. However, Alex's computer, which ran on a different operating system, didn't natively support .rar files but could easily handle .pkg files, which are installer packages used on macOS.