You can identify the SID by using
from the Windows NT Server 4.0 Resource Kit.
Windows NT 4.0 stores the local profile information in the registry under the following key:
Under the ProfileList key, there will be subkeys named with the SIDs of the users who have logged
on to this computer. (To find the profile information for the user whose locally cached profile you want
to move, find the SID for the user with the
utility.) Inside the appropriate user's subkey,
you will see a string value named