Hi dragonos,
I wrote the LabVIEW wrapper VIs for the TDM Header Writer DLL, so I am familiar with the DLL's functionality. I also wrote many of the LabVIEW wrapper VIs to create DIAdem DAT files, so I am familiar with the Data Set properties as well. The Data Set properties are stored in the TDM header as a custom array of 100 elements, each with a name and a value, which is unlike any other properties in a TDM file. All other TDM properties are stored as scaler name-value pairs. To my knowledge the TDM Header Writer DLL does not have the ability to create this special array property.
The Data Set Properties are no longer visible in the DIAdem 10.x user interface-- instead they are automatically mapped to custom Group properties when the file is loaded into DIAdem. So I'm curious why you want to create them-- are you creating files for customers who work with DIAdem 8.x or 9.x? Or do you have VBScripts which use the Data Set properties? Ideally you would move away from using Data Set properties in favor of custom scaler properties. VBScript DataPlugins also can not create Data Set properties, so this really is a dying technology.
Brad Turpin
DIAdem Product Support Engineer
National Instruments
