I tried another unlock with a different fileset someone was kind enough to upload for me.
I tried your truck set and same problem - at least it presents as the same - 'Application Primo.exe. Hi janch, I guess you might be right about my miserly Mio not wanting to play ball ! Unkind of it. Hi apolyps3, thanks for trying to help - I think that janch is probably right here, but great that you thought of it.