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Here comes a grovelling apology...sorry.I have a multi power point board for my PC and other attach,s Sometimes I have to remove a plug to accomodate another this time it was the hard drive one and it was not replaced for how long I don't know.Hence no recognition of the unit.SORRY !!!Getting back to why I wanted to view the folders, only to find that they are in zip form,Not a folder with the zip.How do you open them using Vista? A bit long winded but thanks.