I'm experimenting with the C# IE_WPF Open CASCADE demo. I'm importing STEP models from multiple files into the app. When I programmatically iterate through the imported models, I would like to be able to identify which model is which. Ideally, I'd like to know the filename that a model came from, though I would settle for some sort of unique identifier. I've searched the docs and the code and have come up empty-handed so far. Any ideas?