Quote:
Originally Posted by theducks
To expand on Lady F
there is an Preferences option to control when Calibres default viewer is used (or let your system handle it).
Open Preferences
Select Interface.
Select Behavior. change the ticks in the right column to your desires
(If you have a external reader, you might want to adjust the preferred output format)
Apply
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To keep expanding (as I unfortunally do as I age), the reader in calibre takes a ridiculously long time to open large PDFs (15 MB or so; I've never opened one that large because I get too impatient). Adobe Reader, Foxit, etc. work much better. If you use calibre's default settings, PDFs are not included in the formats to open in calibre's viewer. If you changed them, you can always follow theducks' directions to reset them. To open a book in calibre, you can click on the book, then click on View, or you can doubleclick on the book's line number to the left of the book's entry in calibre's main screen (I always use the latter). It will then open in either calibre's viewer or the viewer associated with the filetype of the book, depending on the settings in Preferences.