Your option is only go to feature request.
The dialog use last folder always.
It seems like the period would nullify that path. Have you tried to put the target folder in the Documents directory and use the Get ( DocumentsPath )? That would tell if you if your scripting syntax is correct.
I can give it try. But this is the folder where all my iPhone photos are kept and sync. So I thought it better to keep it as it is. Anyway I can try and copy these photos to another target folder at the Document directory and try out your suggestions. Thanks.