A B6I file is a disc image created with BlindWrite 6.x. It contains data copied from a physical disc, which can be used to burn a copy of the disk. B6I files are saved along with .B6T files, which contain disc track information.
About VSO-Software BlindWrite
BlindWrite is a disc copying utility designed for backing up computer game discs. It can create disc images that may be copied to CDs and DVDs. Images created with BlindWrite may also be run directly from a computer using a virtual drive. BlindWrite uses a proprietary disc image format, but supports several other formats as well.