Sorry Caty - I have become a bit lazy, and used to relying on unlocked .img files. Hence I haven't had the need to dig into the depths that you describe above.
However, I have a trip later this week, and decided to try and figure it out for myself, without requesting the forum for unlocked files. I did do a bit of research with my "problem", but nothing obvious popped up.
It didn't occur to me to unrar the .exe file - you live and learn.
I will now apply myself to your helpful solution, and promise to remember in the future.
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