Add-in .NET 4.8 reference to system.data.oledb fails in Inventor 2025

[Wim74]

Dear,

I have an add-in (.NET 4.8) in which I use 'system.data.oledb' for a connection with Excel.

This does not work in Inventor 2025. The reference is missing. Converting the add-in to dotnet core 8 is not an option for now.

Does anyone have a solution for this?

[Michael.Navara]

Try to look at this topic

https://forums.autodesk.com/t5/inventor-programming-ilogic/migration-problem-from-inventor-2024-to-2...

[Wim74]

Thanks for your answer michael. 
It works in iLogic, but unfortunately not in a .net framework addin in Inventor 2025. I do not know where and how to make the reference to oledb.