Hmm... that suggests the model isn't corrupted at all. So why, I wonder, do some models open and some not, with newer .NET versions, even though they don't appear to be corrupted?
The TOOL confuses me to no end.
I imagine that the "Tool" has become less and less functional with each new Net.Framework ugrade and security update. That is why models that it could open in the past can’t be opened today.