Slightly tangential to this thread (for which apologies) but still relevant I think: Has anyone tried to use the HTBfileopen DLL with the new demo version HTB 2021? I have, and found it doesn’t work at all. It just produces ERROR 1100 at the DLL LOAD statement. I have raised a support ticket on this issue. I have tried other DLL Toolkit examples (as provided) and found HTBbuttons also fails. There may be others, but some DO work so it’s not that the DLL feature has been blocked for the Demo or anything of that sort.