MicrosStation V8i : User defined variable in project pcf of workspace

What exactly do you want to know?
Those are not MicroStation-defined variables. They look to be created by whomever developed your project configuration file to point to certain types of information. Since they may be custom-created variables, it's possible that the only person who knows what they were for is the person who created the file.

When I ran _USTN_PROJECTDATASET through Google, I found it is a variable for the Bentley OpenPlant software, and probably its V8 predecessor. The Help for OpenPlant tells me that this variable is used to "point to the location of the OpenPlant 3D Dataset folder".

I can tell you that the first variable appears to point to a specific database file located in a subdirectory of the Dataset folder.
The second and third variables are pointing to other subdirectories of the Dataset folder.

More than that, I can't say. You may be able to ask people over at the OpenPlant Forum if you need more information, but it's still possible that these variables are custom written for your project. If that's the case, then nobody here can help you. We didn't create those variables, and we cannot read minds.

Thanks Mary.

I found its use in the existing tools as configuration variables.

The variable _USTN_PROJECTDATASET was used to direct dataset folder in project configuration.

However now project is workset and dataset is now standards, hence the parameter has also been changed to OPENPLANT_WORKSET_STANDARDS

Regards

Thanks Mary.

I found its use in the existing tools as configuration variables.

The variable _USTN_PROJECTDATASET was used to direct dataset folder in project configuration.

However now project is workset and dataset is now standards, hence the parameter has also been changed to OPENPLANT_WORKSET_STANDARDS

Regards