Are enumeration types 1 or 4 bytes in Delphi? If they are one byte, it looks quite different (and I'm not sure about all the types used here, some seem to be sets, some enumerations). But at the first glance it seems, they used both packed records to either ensure minimum size or known record layout (maybe they even used the structure in some assembly module?), and also aligned them manually to avoid unaligned access issues.
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