In this case, I would like to chime in and state that I have Contract Configurator running on a Win 64 bit version without any errors with the Anomaly Surveyor and Tourism Plus Packs (as well as Kerbin Space Station and SCANSat configs provided by other authors). Field Research was giving errors but I just removed it and did not report it as I understand that bug reports are not necessarily productive in Win64. But yes, there are people that are using it just fine in Win64 (after your support change I reverted back to 1.3.4 for the moment).