[Samba] strange group id (unix-group.2147483404)

[David Mulcahy]

Hello All

I have samba 2.2.4pre as a PDC and a Win2k box has a strage group id

In Control Panel -> Users and Passwords -> Advanced -> Advanced -> Groups -> 
Administrators (or Users) There is a strange id

It fist appeared as domain\unix-group.2147483404 but now it has changed to
\S-1-5-21-1192771753-1172337734-1285899934-513

Is this something to worry about or can I safely ignore it. (I cannot delete 
it).

Thanks 
David Mulcahy