BT6 files from BlindWrite are used to reproduce the original copy of the disk image. Some programs like AstroBurn or ISOBuster can processes .b6t files and possibly recover and save the data as a ISO image. Otherwise, you will need the original disk image.
Convert BlindWrite table of contents file to CD/DVD/HD DVD/Blu-ray disc ISO binary image.
We found one software available in the database for this conversion.
Microsoft Windows software - convert b6t to iso on Windows
A handy tool for burning and mastering of optical media
Convert from b6t file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.