Set the list separator character on your PC to a comma.  Please note, these steps are for Windows 7, so they may vary slightly for other Windows versions.
  1. Click the Windows Start menu.
  2. Click Control Panel.
  3. Open the Regional and Language Options dialog box.
  4. Click the Formats Tab.
  5. Click Additional settings…
  6. Type a comma in the List separator box.
  7. Click Apply.
  8. Click OK twice