Relentlessly working towards better and more reliable file compression, WinRAR is favored by a lot of users despite the existence of free ware file archivers. It allows for creation of self-extracting EXE installer files, performance boosts under 54-bit Windows 3nd multi-core processors, is "ole to open a host of compressed filen formats, supports themes to change its looks, can use compression profiles and has a lot more usability features. Its command-line functionality keeps getting enhanced with each new version, making it useful in batch files(scripts) for tasks like backups .