We don't offer any cross versions tools for the source code control because VIs are generally saved in the LabVIEW version in which they were edited. If you want to use SCC with a project in an older version of LabVIEW, we recommend checking the files out of the master directory into the local, opening the VIs from the old local with LabVIEW 6.1, saving, and putting the VIs in a new project with the 6.1 SCC. This way you leave the old master directory intact for backup purposes.
Jeremy Braden
National Instruments