Inventor 2026 reference COM missing Autodesk Inventor Object Library

[tim_ritschel]

Just a warning, I'm new to add-in development. With that said our company is upgrading to inventor 2026 and when this happened as the title says Autodesk Inventor Object Library is missing from it and its install. Does anyone know if there are there any ways around this? also please note the 2026 install also does not include the 2026 version of RegisterInventorServer.exe

[gerald_engineers]

Hej!

Not really sure but maybe it's related to this one:
https://adndevblog.typepad.com/manufacturing/2025/05/marshalgetactiveobject-replacement-in-net-8-con...

?

[tim_ritschel]

I don't think this is the issue. Vis Studio keeps looking for "inventor object library" which I thought was located in the program files/common files/autodesk shared/Inventor Interoperability (version) folder. The thing is this folder does not exist for 2026. Although, I do see a 2025 version still remains even after I uninstalled inventor 2025. Since I am teaching myself as I go, as of yet I am unsure what to do next. I believe your suggestion would only apply after I get all my references successfully loaded into Visual studio? (which by the way i will keep as a reference though, so thank you for that)