You can read any format in any program you choose directly from the book list, no need to copy anything anywhere..
If your books are in ePub format you could use Edge, ADE, or any other Windows ePub viewer including the calibre viewer. If you uncheck the format in the Preferences->Behaviour->Use internal viewer list then calibre will use whatever you have configured in Windows for that file type. If its checked then the calibre viewer (reader) will be used.
And calibre's built-in Open With feature can be used to open formats in alternative viewers - e.g. you might ordinarily view comic formats (CBR and CBZ) with Comical, but on occasions you might want to open them WinRAR; the Open With feature makes this possible. You can configure Open With by right clicking a format in the Book Details panel (normally the right sidebar).
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