LFSO allows the following syntax to retrieve Windows Groups:

ILFSecuredDomainAccountCollection winUsers = (ILFSecuredDomainAccountCollection)db.SecuredDomainAccounts;
LFDomainAccount acct;

for (int i = 1; i <= winUsers.Count; i++)
{
	acct = (LFDomainAccount)winUsers.get_Item(i);
	if (!acct.IsDenied && !acct.IsUser)
	{
		GroupData newGroup = new GroupData();
		newGroup.name = acct.Name;
		newGroup.id = acct.SID.ToString();
		Array.Resize(ref groups, groups.Length + 1);
		groups[groups.Length - 1] = newGroup;
	}
}

I am trying to reproduce this behavior in RepositoryAccess, but only got this far and cannot determine if a  Windows trustee is a user or a group.

using (WindowsAccountReader winUsers = Trustee.EnumAllWindowsAccounts(session))
{
  foreach (TrusteeInfo acct in winUsers)
  {
    if (acct.TrusteeType == TrusteeType.WindowsAccount)
    {
      GroupData newGroup = new GroupData();
      newGroup.id = acct.Sid.ToString();
      try
      {
        System.Security.Principal.NTAccount ntAcct = (System.Security.Principal.NTAccount)acct.Sid.Translate(typeof(System.Security.Principal.NTAccount));
        newGroup.name = ntAcct.ToString();
        //if (!IsGroupAccount(ntAcct)) continue;  <---- Need method to determine if group.
      }
      catch (Exception)
      {
        newGroup.name = "";
        continue;
      }

      groupsList.Add(newGroup);
    }
  }

  winUsers.Close();
}

The Laserfiche Admin Console displays whether a Windows Account is a user or a group. Does the RepositoryAccess SDK have this feature or is there another recommended way to determine this? Thank you.