B6T is an extension that is specific to files related to BlindWrite optical storage media (CD and DVD) backup and management software. B6T is a file used to store information about a copy of a disc created in the program in a file with the B6I extension. This data is a kind of table of contents found in the B6I disk image.

The B6T extension was introduced with version 6 of BlindWrite. Older versions used the BWT extension for this type of file, and version 5 used B5T.