Quote:
Originally Posted by swampwiz
I found a further aspect of this error/ Not only does the filename need to have no spaces, but the complete path also needs to have no spaces. I verified this by moving the EPUB files between directories that either had of did not have spaces. 
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No need for head slapping. What you describe is not normal Windows 7 behavior. Once the proper file association is set you should be able to double-click any ePub file whether it has spaces or not and have it open up in calibre's viewer. At least you have more info if you decide to keep investigating this problem.