If I have only 1 alternate cover, I add it to Calibre and merge it to the book. If I've found more pictures and stuff to add, I make rar file and merge that.
Adding+merging informs Calibre about additional format (jpg, rar) and ensures that everything stays together. Sometimes I may add txt with notes (1.opens faster than rar, 2. adding it is simple drag'n'drop operation)
As an added bonus I don't have to bother with filenames - ppp.rar will be 'Isaac Asimov - Foundation' after merging.
When I at last want to edit some epub all I need is to search for jpg format and choose from the results.
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