bugfix in calibre's "oeb/base.py"

def read(self, path):
        if path is None:
            path = self.opfname
        path = os.path.join(self.rootdir, path)
        try:
            with open(urlunquote(path), 'rb') as f:
                return f.read()
        except:
            with open(path,'rb') as f:
                return f.read()
            # Pype: how about files that really hold %2f in their name?