If you want create add registry file, which add information to current user
like this:
[HKEY_USERS\S-1-5-21-3810145928-4034201778-1548147441-
1606\Software\Fortinet\SslvpnClient\Tunnels]
you have to change entry to this :
[HKEY_CURRENT_USER\Software\Fortinet\SslvpnClient\Tunnels]