Before dissecting the serial number mechanics, it is crucial to understand the software’s role. Vijeo Designer 6.1 is a legacy but widely used version of Schneider Electric’s configuration software for Magelis line of HMIs (XBT GH, XBT GT, XBT GK, and HMISTO, HMISTU series).
For Vijeo Designer 6.1, legacy project files (with the extension .vdz ) are typically stored in the project folder, by default located in a directory such as: C:\Program Files (x86)\Schneider Electric\Vijeo-Designer [version]\Vijeo-Runtime\Public\Projects\
In Vijeo Designer, the term "Reference" usually refers to the specific (part number) or the Serial Number itself.
The Build Time license is for the configuration software used to create the HMI project on a PC, while the Runtime license is for the software that executes the project on the target HMI hardware or on an industrial PC (iPC). They are typically separate purchases.