Ah I see. Yea, the import dat-file works the same as with raw chunks. The insertion point is from the node you have currently selected, so you usually just have to point to one of the nodes at the end of the file (or at the end of all child nodes of a certain node) before importing.
The ordering of individual chunks is very important. Child nodes/objects can't be in front (index wise) of a parent. Model and material chunks must also exist before a node uses them. If not done, you will be guaranteed to get a CTD.
The change of parent id's is not really necessary in between, you can also do it after importing but that's only a procedural thing. Whatever works.
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