Roles Information... (TS 6.7.1sp1)

System

Does anyone know where the Roles per branch information is stored in TS 6.7.1sp1? I know that the roles are defined in roles.xml, but where is the information that was previously stored in *.uid files now.

Previously I had workflow launch pages with drop downs that were populated by the uid files, and I would like to maintain the capability. I have already written custom DataSources that read from the old uid files, but when changes are made to users/roles for a branch this file needs to be updated manually.

Any thoughts, suggestions?