Disc image created using DiscJuggler software; supports CD-R, CD-RW, DVD-R, DVD+R, DVD-RW, and DVD+RW formats; used for disc duplication, extraction, and mastering.
Program(s) that open cdi files
Windows: Padus DiscJuggler; EZB Systems UltraISO; IsoBuster; PowerISO
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/cdi
