Try this:

Make a copy of the file

Open the copy in RealBand

Then Select 'Save As' and choose a Band In Box file type (see image)

See if the Saved As version can open in BiaB.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
2018-11-03_03-09-52.jpg (52.57 KB, 169 downloads)

BIAB & RB2024 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones