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Hi @joe_love-gunn. There are always at least 4 PropertySets in every document, but some may have more than that. The fourth PropertySet is always the 'custom' one. It will always exist, but it will not have properties in it, by default, until you add some into it, one way or another. The name of that PropertySet is "Inventor User Defined Properties" (in English), and its 'InternalName" is "{D5CDD505-2E9C-101B-9397-08002B2CF9AE}", which will work in all languages. I usually just specify PropertySets.Item(4) though, because it is always at that Index position.
The first 3 PropertySets are a fixed size, so we can not add more Properties into them, or remove any properties from them. And only some of those properties are Read/Write, while many are ReadOnly.
I have attached a PDF of an Excel sheet I created, which shows all all the 'standard' PropertySets & Properties, but also shows a coupe of the others (not all possible others though).
Wesley Crihfield
(Not an Autodesk Employee)