Boston_pops_williams.part1.rar
Because this is labeled part1 , it cannot be opened alone. You will need Boston_Pops_Williams.part2.rar , part3.rar , etc., in the same folder to extract the content.
Use a file archiver tool like WinRAR (Windows), 7-Zip (Windows), or The Unarchiver (macOS). Boston_Pops_Williams.part1.rar
Check if a checksum file (like .md5) was provided to ensure no files are corrupted. Extract: Open part1 with your archive software and extract. Because this is labeled part1 , it cannot be opened alone