Opening PDF Books in Calibre Viewer.
Can anyone help me.
Since up-grading to Windows 7 I am unable to open books in PDF format with Calibre's built in viewer.
When I double-click the PDF logo a message box opens saying that a new book is being added, then asks if I want to add a duplicate.
I have the latest version of Adobe Reader X and running Calibre 0.8.13 on my computer.
Many thanks....
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