I wish to use LINQ to SQL in a plugin, so I copied System.Data.Linq.dll from the .NET 4.8 Framework refrence assemblies into the Managed folder and added a reference in my plugin ("// Reference: System.Data.Linq"), however, I only get "Referenced assembly is invalid", which apparently occurs only, if the file is not found (it’s there, though). What am I missing? Is it even possible?