I am trying to control a FT601 USB3 interface chip via a C# wrapper that FTDI provide. Unfortunately, they don’t provide an example of using VB.net to do this, but advise that it should be possible. I have written a simple test program to see if this works and it appears to have no errors, but running the call results in a ‘System.IO.FileNotFoundException’, despite having referenced the dll in the project. It seems that I may not be calling the dll correctly, but I haven’t spotted the problem.