Mr. Strijks,
Although it will work, it is not recommended to upgrade the Fieldpoint Explorer from 3.0.2 to version 4.0 when using LabVIEW 6.1. The changes that where made within version 4.0 (the new features) are not supported on LabVIEW 6.1, so you would not benefit from it.
Regards,
RikP
Applications Engineering
National Instruments
Rik Prins, CLA, CLED
Software Development Engineer