After configuring the IPlugin as described in the article in the 'Additional Information' section below, one sees an exception in Event Viewer, when WorkFlow Manager (WFM) tries to load the IPlugin –
AMS Web Application PluginManager Exception:LoadTypes() Exception information: Type: System.IO.FileLoadException Source: mscorlib Message: Could not load file or assembly 'file:///D:\WorkflowManager\wwwroot\bin\Plugins\IPlugin.Test2.dll' or one of its dependencies.