Hello,

It looks like no utility out there can write BSB/KAP files. Many can read.

You can use RasterChart2BSB utility :
http://www.justmagic.com/RasterChart2BSB.html
This webpage is in French but the software is quite simple to
understand (see the video).
By the way, use the MacOSX version.
The Win and Linux versions are adaptations created by a student and
are a little buggy.
But open source code is available for programmers for these
environments...

Best regards.

--
Peio Elissalde
Magic Instinct Software