Quote:
Originally Posted by BetterRed
There are situations where the Windows registry entries for the epub (other file types too) can get corrupted so that you can't re-associate it. It's known to have been caused by a failed Calibre install
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Since calibre doesn't mess with file associations during install I find this assertion interesting. I may be wrong but I do not think there is any corruption of the Windows registry involved.
Quote:
Originally Posted by BetterRed
in my case I think it was related to an uninstall of 32bit Calibre that I did on Thursday last week.
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Since a calibre install or uninstall doesn't mess with file associations, when you remove the 32 bit version and change to the 64 bit version any previous association stands and is still pointed to the old folder. In order to re-associate ePub with the new 64 bit version you do need to find the registry entry and change the path or as you did run a registry cleaner.