Calibre can't extract cbz/cbr cover with __macosx folder
I noticed Calibre 2.49 can't generate cover from CBZ/CBR with __MACOSX folder in them.
I test with three different files with same result.
However, editing these files with WinRAR to delete the __MACOSX folder solve the issue each time.
My guess is Calibre has some difficulties to handle a folder within an archive starting with double underscore.
Windows 10 x64
Calibre 2.49 x64