Many thanks for the replies. I did download this file when I first purchased my ebook but as I hadn't come across the acsm file type before, I dismissed it.
It now seems that this file is just the key the the ebook file and I need to download Adobe Digital Editions to get the physical epub file.
Pity calibre doesn't give any help on this, to a newbie it's a bit of a showstopper.
Here's hoping.
Many thanks.
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