Quote:
	
	
		| 
					Originally Posted by AnemicOak  Sounds like the internal structure of most ePub files to me. Did you try opening the file with some form of ePub reading software either on your computer or Android device? | 
	
 I tried opening it from Calibre on OS X and got this error:
	Quote:
	
	
		| calibre, version 2.42.0 WARNING: Errors while adding: There were problems adding some files, click "Show details" for more information
 
 Failed to add the file /Users/s/Desktop/appleHumanInterfaceGuidelines.epub to the book: /Users/s/Desktop/appleHumanInterfaceGuidelines
 With error:
 Traceback (most recent call last):
 File "site-packages/calibre/gui2/add.py", line 399, in add_formats
 File "site-packages/calibre/db/cache.py", line 1354, in add_format
 File "site-packages/calibre/startup.py", line 198, in local_open
 IOError: [Errno 21] Is a directory: u'/Users/s/Desktop/appleHumanInterfaceGuidelines.epub'
 | 
	
 When I tried uploading the epub file to Google Drive in order to download from GD to the tablet and open it in Aldiko, it showed up as folder, not a file and stopped there. It should show up as a file, no?