Rarissimo is a file utility that enables to automatically compress and/or uncompress files. Rarissimo is a companion tool for the award winning compression utility WinRAR. Rarissimo is distinguishable from other compression solutions by its ability to fully preserve NTFS alternate streams. This feature allows to automatically compress/uncompress Macintosh files stored on NT volumes preserving their filenames and peculiar structures - it means for example that you can use Rarissimo to send and receive Macintosh files using any standard FTP process (and not only Mac-based programs).