Jerry,
would it be possible to export your HKEY_CURRENT_USER\SoftwareCatalog keys/subkeys/values to a .reg file and send it to support@lindersoft.com so we can import it here? SetupBuilder uses pure Windows APIs to process the Windows registry and there is no code in the runtime that treats '@' items differently.
This is what I see in our tests (see attached screenshot). It retrieves the @Risk 6.2 sub-key without any problem.
Thanks,
Friedrich