Where are the official documentations for the .blend file format?

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Welcome to the board.
Alas, there is no official documentation - by intent. Here are some related threads which, in part, go into why there isn’t a ‘Blender File Format Reference Manual.’

  1. [blend_info] Use Rust to inspect Blender files
  2. Blend file structure documentation
  3. .blend file errors

That said, if you could expand somewhat on what portions you want to consume and what you hope to accomplish, then perhaps some fellow traveler on this road can help with pointers. Thanks!

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