Quote:
Originally Posted by avid01
By the way, the current version of the Oxford dictionary came with the Kindle is about 66 MB. I did not dare to open that in Calibre. 
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You've been informed that calibre's viewer has to convert the file to a basic epub before it can view it. Also dictionaries are very cpu and memory intensive and often will not covert in calibre. This is a known limitation of calibre.
Quote:
Originally Posted by avid01
It opens in a second in the Kindle desktop reader. I like free software but should I use just that for my desktop reading needs instead of Calibre? 
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Since it doesn't have to be converted it should open quickly. If it works for you then yes you should use this instead of calibre for viewing those files types.