How to add or remove sites from trusted sites in registry

Trusted sites are stored in:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains

Here is an example where all protocols from sites ending with google.com are trusted and http protocol is tusted from www.microsoft.com.

Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains]
@=""
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\google.com]
"*"=dword:00000002
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\microsoft.com]
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\microsoft.com\www]
"http"=dword:00000002

The dword value in this example is 00000002.

You could also use:

1 to assign a site to the Intranet Sites zone.

2 to assign a site to the Trusted Sites zone.

3 to assign a site to the Internet Sites zone.

4 to assign a site to the Restricted Sites zone.