>I think that's likely to lead to grief. I am very aware of that. Hence the intention to rename the existing DLLs with suffix <i>OLD</i> in case needed to roll back. I keep away from the OS disk, never add anything to system folders and never modify environment variables (in spite of various suggestions to put mod_spatialite in System32). The DLLs on my computer are in different applications e.g. Dell Support Assist =, Notepad++ etc. I've noted the existence of SQLite.Interp.DLL - What is it? Is it meant to for Dot Net? Or, is it an COM object?