The structure GdiplusStartupInputEx contains a field with the enumeration type Version. It is described in the Remarks section of the same page.
However, the metadata of the enumeration refers to https://learn.microsoft.com/windows/win32/TaskSchd/taskschedulerschema-version-registrationinfotype-element, which can't be right. There seems to be a mixup.
The enumeration is odd anyway. It's the only enumeration in the entire metadata without global scope. All other types with restricted scope are nested, anonymous types.