Interestingly, the "magic number" (hexadecimal signature) used to identify a RAR 5.0+ file actually begins with 52 61 72 21 .
Originally built for older versions of Windows, including Windows 9x , Me , NT , 2000 , and XP . Ah52 rar
RAR archives use advanced algorithms to save disk space and can be split into multiple parts. including Windows 9x