$AdObj = New-Object System.Security.Principal.NTAccount('user')
$strSID = $AdObj.Translate([System.Security.Principal.SecurityIdentifier])
$strSID.ValueSo the 'HKEY_CURRENT_USER' when running as 'user' can also be accessed at 'HKEY_USERS\S-1-5-21-2607664055-1112657780-300677247-500'.
Difference between HKEY_Current_User and HKEY_USERs?
Suggests edits to HKEY_USERS should be reflected in HKEY_CURRENT_USER