After you download a file, you open its Properties and find that it is automatically marked with “This file came from another computer and might be blocked to help protect this computer.” warning and you have to unblock the file manually by selecting the “Unblock” check box.
1. Open Group Policy Editor (gpedit.msc) as Administrator.
2. Go to User Configuration > Administrative Templates > Windows Components > Attachments Manager.
3. Enable Do not preserve zone information in file attachments option.
What is zone information?
Zone information is the information about the zone of origin (such as restricted, Internet, intranet, local) of downloaded files.
By default Windows marks downloaded files with information about their zone of origin (such as restricted, Internet, intranet, local) to make risk assessments in order to warn users when they open or execute files which are marked as being from the Internet or Restricted Sites zone, unless the file’s zone information has been removed.