Fix #4426 (Error opening epub for view)

src/calibre/utils/zipfile.py

@@ -4,6 +4,7 @@ a zip archive.
 """
 from __future__ import with_statement
 from calibre.ptempfile import TemporaryDirectory
+from calibre import sanitize_file_name
 import struct, os, time, sys, shutil
 import binascii, cStringIO
 
@@ -1038,6 +1039,10 @@ class ZipFile:
 
         source = self.open(member, pwd=pwd)
         if not os.path.exists(targetpath): # Could be a previously automatically created directory
+            try:
+                target = open(targetpath, "wb")
+            except IOError:
+                targetpath = sanitize_file_name(targetpath)
                 target = open(targetpath, "wb")
             shutil.copyfileobj(source, target)
             source.close()