Is there a sheetset assembly for .NET for BricsCAD?

Hi All.

Referencing AutoCAD from .NET, there is an AcSmComponents##.tlb assembly that allows .NET to interface with a sheetset .DST file. It's located in the following folder :

 C:\Program Files\Common Files\Autodesk Shared\

What assembly does BricSys use to interface with .DST sheetset files? Is this API available? Does anyone know?