Your .fbc files have been saved with a version of FTM 16 or earlier. Probably much earlier, as in the early days before CDs and USB memory drives, we saved to floppies that were split by FTM to back up a file.
I have never tried to restore them by trying to join them outside FTM. Not sure if it would work as I suspect that each file has some code linking it to the next disk.
Also FTM 2012 etc will not open a .FBC file which is a proprietary FTM compression format.
I think the approach that I would take is as follows
I would download and install the free FTM 2005 starter edition (SE) seehttp://ftm.custhelp.com/app/answers/detail/a_id/3673/kw/unsu...
In terms of reading the floppies, I assume that you do not have a floppy disk slot on your computer?
What I have, and I am sure that they are still around, is a floppy drive that plugs into my computer when I need it via a USB connection.
So I would install the SE and beg borrow or steal a USB floppy drive. If you Google "USB floppy drives" there seems to be a number of links
I would then restore the .FBC files using the restore in the SE
This should let you end up with a single file in FTM 2005 format which can be readily opened by FTM 2012, or one of the recently current versions
You can then delete (uninstall the SE)