We are using the VeriStand SystemDefinition .NET API to automatically generate VeriStand .sdf files. However the SystemDefinitionAPI only seems to work when accessed in 32Bit applications (in our case Matlab/Simulink). As in the future more and more applications will only be available as 64Bit versions, this very convenient VeriStand feature will no longer be usable for us. Thus I strongly suggest for to provide also a 64Bit compatible version of the SystemDefinition .NET API. Interestingly, other VeriStand .NET APIs (like the Execution API) seem to work well even when accessed from 64Bit applications.