Additional custom assemblies can be included in your extension builds by specifying them in a special configuration file dotnetext.cfg in the FTGate application folder.
This file contains one entry per line and is the name of the assembly dll to load relative to the FTGate installation folder.
For example if you wish to load a library called MyLibrary which is a .NET assembly you could place the dll file in the Extensions subfolder, in which case the dotnetext.cfg file would contain:
Extensions\mylibrary.dll After making changes to the configuration file, or any library, you must restart FTGate