To remove the Zone:Identifier files, execute:

find . -name "*:Zone.Identifier" -type f -delete

Then to prevent these files from showing up again…

  1. Open gpedit.msc
  2. Open `User Configuration > Administratives Templates > Windows Components > Attachment Manager
  3. Double-click on “Do not preserve zone information in file attachment” and set it to enabled
  4. Press ok